BRUSSELS (AP) — Heavily armed police swept into Brussels neighborhoods Friday in operations linked to this week's bombings as well as a suspected new plot in France, detaining three people and shooting two of them in the leg. One man was carrying a suspicious bag while accompanied by a young girl.As Easter weekend began, jittery Europeans faced uncertainly about how many violent extremists remain at large, and where and when they might strike again.On Friday afternoon, two blasts and gunfire rang out in the Schaerbeek district of Belgium's capital, where police earlier found explosives and bomb-making material in an apartment used by the suicide attackers who killed 31 people and wounded 270 in assaults on the Brussels airport and subway.Authorities, meanwhile, confirmed one of the attackers at the airport was the bomb-maker who made explosive vests used in last year's carnage in Paris — the most definitive link yet between the two attacks, both of which have been claimed by the Islamic State group.On the third and final day of national mourning, U.S.