Last Updated Mar 25, 2016 4:37 PM EDT
BRUSSELS -- Police raided Brussels neighborhoods Friday in operations described as linked to this week's bombings as well as a suspected new plot in France. They detained three people and shot two of them in the leg, including one who was carrying a suspicious bag while accompanied by a young girl.
Gunfire and two blasts rang out in the Schaerbeek district, the same area where police had earlier found explosives and bomb-making material in an apartment used by the suicide attackers who killed 31 people and wounded 270 on Tuesday in the airport and subway.
The district also was raided Thursday night. Police also searched the Forest and Saint-Gilles neighborhoods Friday, the Belgian federal prosecutor's office said, detailing the arrests and shootings.
Dozens of heavily armed officers began the operation about 1:30 p.m., when there were "two big explosions," resident Marie-Pierre Bouvez told The Associated Press, and it lasted about two hours. It was not immediately clear if the blasts heard were controlled explosions.
A man who was seen sitting at a tram stop with a young girl was ordered by police "to put the bag far from him," and after he did so, police shot him twice, apparently in the leg, said resident Norman Kabir. The girl was taken into safe custody, and a bomb-squad robot searched the bag, he added.
State broadcaster RTBF said police apparently feared that the bag held explosives.
Schaerbeek district Mayor Bernard Clerfayt told RTBF the raid was linked to the Brussels attacks as well as Thursday's detention in France of a man suspected of plotting a new attack.
Bouvez said police kept the area locked down and shouted at her to "get back inside" when she tried to go into the street.
On the third and final day of national mourning for victims of the attacks by Islamic militants, Prime Minister Charles Michel skipped a wreath-laying ceremony at the airport with U.S. Secretary of State John Kerry because of the police raids.
In an interview with CBS News Friday, Kerry insisted that the U.S. is winning the fight against the Islamic State of Iraq and Syria, or ISIS, despite the Brussels bombings.
CBS News correspondent Vladimir Duthiers asked Kerry how the Obama administration can claim the U.S. is winning the battle under the circumstances.
"Because we are winning," Kerry told Duthiers. "The fact that you can strike by sending a couple of would-be suicidal people into an airport to blow up a bomb does not indicate that they're winning. It means they have just struck a horrible blow and been willing to take lives with them."
Kerry, in a hastily arranged visit, defended Belgium's counterterrorism efforts despite a series of security and intelligence failures before the bombings.
Confirming that several FBI agents are involved in the investigation, Kerry told reporters the "carping" about Belgium's shortcomings "is a little bit frantic and inappropriate."
Top members of Belgium's embattled government are being criticized over its counterterrorism efforts since - and before - the Nov. 13 Paris attacks that killed 130 people and that authorities believe were plotted from Belgium.
Kerry also said the U.S. and other countries had already scheduled meetings with Belgium prior to the attacks about improvements they could make to their laws, intelligence collection and attempts to blunt the radicalization of youth.
ISIS has claimed responsibility for the attacks in Paris and Brussels, and Kerry lashed out at the extremist group.
"We will not be deterred," he said. "We will come back with greater resolve - with greater strength - and we will not rest until we have eliminated your nihilistic beliefs and cowardice from the face of the Earth."
Authorities also announced that American, British, German, Chinese, Italian, French and Dutch citizens were among the dead.
A manhunt has been underway for one of the airport attackers who was recorded on a surveillance video and fled the scene. Prosecutors have not said how many attackers there were in total, or how many accomplices might be at large.
But they said that DNA analysis and an official investigation had confirmed one of the suicide bombers at the airport was Najim Laachraoui, 24, a suspected bombmaker whose DNA was also found on a suicide vest and bomb used in the Paris attacks. Officials had earlier in the week confirmed his identity, thus linking the Brussels and Paris bloodshed.
Belgian prosecutors said raids Thursday night targeted central Brussels, Jette and the Schaerbeek neighborhood. Three of six people detained in those raids have been released, prosecutors said.
French counterterrorism police also detained a 34-year-old man Thursday who officials say was in the advanced stages of an attack plot.
CBS News correspondent Debora Patta reports that the suspect, Reda Kriket, was convicted in absentia in July in Belgium for recruiting ISIS members along with Abdelhamid Abaaoud, one of the key leaders of the Paris attacks.
Kriket, a 34-year-old French national, was convicted alongside Abaaoud of being part of a jihadist network planning to travel to Syria.
During the raid on Thursday that ended in his arrest, police found a small quantity of explosives at the apartment in Argenteuil, on the northern outskirts of Paris.
Meanwhile, the top suspect in the Paris attacks, Salah Abdeslam, who was captured in Brussels one week ago, has stopped cooperating with police and "no longer wants to talk," said Justice Minister Koen Geens. He exercised his right to silence during the second of two rounds of questioning on March 19, prosecutors said. France is seeking his extradition, and his lawyer said he is prepared to go.
Elsewhere, Belgium's nuclear agency said it has withdrawn the entry badges of some staff and denied access to other people recently amid concern the nuclear plants could be a target.
The move at some plants "is not necessarily linked with the terrorist attacks," said nuclear control agency spokeswoman Nele Scheerlinck, noting the decision to deny access usually takes weeks.
Immediately after Tuesday's attacks, security was boosted around Belgium's nuclear sites, and hundreds of workers were sent home.
Last month, authorities said searches after the Paris attacks uncovered video linked to a person working in Belgium's nuclear industry.
Belgian media reported this week that Brussels attackers Ibrahim and Khalid El Bakraoui had video of the home of a senior official at the Mol nuclear waste facility in the Flanders region. It's unclear why.
In the neighborhood of Molenbeek, home to some who took part in the Paris attacks, Sheik Mohamed Tojgani denounced the Brussels bombers during a sermon before Friday prayers.
"Terrorism is terrorism," said Tojgani, the imam of Molenbeek's main mosque. "It has no state, no nationality, no religion, no country."
In a message to the Belgian people, he added: "You are from us and we are from you. What affects you, affects us."