"During the legal timeframe - 48 hours - (police) checked and searched for facts needed for an indictment. After 48 hours, detainees were released", police said in a statement on Saturday.
In his last story, Kuciak's linked several businesses operating in Slovakia to the Italian mafia and detailed past connections between the companies and two of Fico's aides.
Thousands marched in Bratislava and other Slovak cities on Friday, demanding swift action in response to a killing that has shocked the country and shaken its government.
Kuciak, 27, reported on tax and subsidy fraud and links between businessmen and local politicians.
Thousands of Slovaks are attending a national rally to honor an investigative journalist shot dead last week along with his partner.
Some of the protesters at the peaceful march then moved to the office of Prime Minister Fico to demand the government's resignation.
The seven suspects were detained during raids in seven locations in eastern Slovakia.
Police investigating Mr Kuciak's death detained seven people on Thursday, releasing partial names that matched subjects referred to in the final article. He has likened journalists to "filthy prostitutes".
Christophe Deloire, the director-general of Reporters Without Borders, on Friday said he asked Fico to "express regret after insulting journalists and commit to avoid weakening investigative journalism". Both Troskova and the secretary have denied any wrongdoing.
A retired Italian anti-Mafia prosecutor said Italian prosecutors had warned authorities in Slovakia of "dangerous" infiltration by a powerful organised crime syndicate before the killings.
Franco Roberti said on Italian radio: "We warned authorities in Bratislava, but unfortunately they didn't heed us" about the 'Ndrangheta syndicate's expansion into Slovakia.
Mr Roberti suggested the group may have killed the journalist as "there was no other way to silence" him.
Meanwhile, global media watchdog Reporters Without Borders (RSF) on March 2 warned European Union leaders against undermining the security of journalists in the wake of Kuciak's murder.
A source said: "With the support and abilities she has to hire nannies and assistants, she's been a really, really great mom. My attractive and healthy baby girl arrived February 1st and I just couldn't wait to share this blessing.
We don't know what Allen will run but if he ends up in the upper 4.5s, that is going to push him down in a talented draft group. If that rule changes, theres going to be a lot of defensive backs grabbing and pulling guys, so that wont change..
He asked nearby residents to call police if they spotted the suspect , whom police belive to be risky and within city limits. Correction: An earlier version of this story reported that police have confirmed the victims as the suspect's parents.
I want to win trophies. "I'm really happy, we had a great attitude too", Jose Mourinho told reporters after the crucial win. United paid £75m to sign Lukaku from Everton in last summer's transfer window. "I made the right choice for me", he said.
One day later, the longtime Trump aide has announced she is leaving the White House, reportedly in the next few weeks. Asked about the email on Tuesday, she told the committee she did not view it as significant, the sources said.
I can do it all. "I would be absolutely stunned if he doesn't go in the top five". "I try to be a versatile player". I'm not going to preach that as gospel, but I felt like it was a pretty accurate couple of clicks on the stopwatch.
He added: "And we are supporters of the 2nd Amendment, just as we embrace the entire Constitution of the United States". Meanwhile, MetLife, Hertz and others have joined Delta in ending business ties with the NRA.
The newbie in Sports Entertainment Ronda will also feature in wrestling's biggest spectacle after her successful contract signing. Rousey was part of a cameo with Dwayne " The Rock " Johnson and left McMahon a little worse for wear after a brief altercation.
Witnesses told The Associated Press that they saw five attackers in a pickup truck heading toward the French Embassy. Responsibility was claimed by a group called Al-Qaeda in the Islamic Maghreb (AQIM).
Michelle Shaffer, 45, of the coastal MA town of Hull, lost her appliances beneath 5 feet of water during the last big storm. The National Weather Service said winds are expected to increase drastically during the day, peaking in Friday afternoon.
Indoor Championships in Albuquerque, N.M., cleared 7 feet, 6 inches on his third and final attempt for his placement. Next on the agenda - or so she thought - was a flight, which later switched to a train as conditions worsened.
The Metropolitan Police Department will lead an investigation into the shooting with the support of the Secret Service. Ford, who tried to scale the White House fence past year , was carrying a pistol without a license, according to cops.
The Maryland Emergency Management Agency reported more than 65,000 power outages were reported across the state Friday morning. Use extra caution.Stay tuned to NOAA Weather Radio or your favorite source of weather information for the latest updates.
Sources say that the Japanese gaming firm is focusing more on releasing new peripherals and accessories for the Nintendo Switch . Other peripherals are thought to be in the works that attach via the USB Type-C port and/or include network-related features.
Dick's Sporting Goods Inc. said this week it would no longer sell assault-style rifles in its Field & Stream stores. Mountain Equipment Co-op, known as MEC, said in a statement that it will stop carrying Vista Outdoor products.
John's father went to her Wake home after learning from his daughter's coworkers that she never made it to work, Maj. John, the Middlesex mom who went missing on Tuesday morning, was found dead in a forest clearing near her residence.
ICE said one of the people who eluded them was a Honduran arrested for transporting cocaine and for sex with a child under 16. Local 2 union, which represents thousands of workers in the service industry in the US and Canada.
Worries about the possibility of much higher interest rates have been at the centre of the market's troubles over the last month. The S&P 500 trimmed its loss as the day went on, and it was down 7 points, or 0.3 per cent, at 2,670, as of 1:40 p.m.
Open and can be special, 18 holes between two players makes for poor viewing and often a letdown from the mania of Sunday. Open, however, as the USGA is also instituting this system across the women's and senior's tours.
This week marks the official return of Formula 1 with pre-season testing kicking off today at the Circuit de Barcelona-Catalunya. We will never race in this circumstance, and the only thing you do is risk the vehicle .
This game will make friendships and basically play out your life and also give a feel like you were in the actual story. The game is coming to both Google Play and the iOS App Store, and Google Play users can pre-register for the game now.