The investigation into last week's bombings in Belgium extended farther across Europe after Italian police arrested a new suspect thought to have provided false documents to the Isis (Islamic State) militants behind recent attacks in Brussels and in Paris.
The Italian arrest adds to an emerging picture of the network that staged some of the worst attacks on European soil since World War II, another striking indication of the reach of Isis beyond its strongholds in Iraq and Syria.
Fears remained heightened across the continent nearly a week after suicide bombers killed at least 31 people at Brussels Airport and, an hour later, in a crowded subway car. Dutch anti-terrorism police arrested a 32-year-old man in Rotterdam on suspicion of preparing an attack on France and also detained three other people, national prosecutors say. "French authorities requested the arrest of the French citizen, who had been identified in a terrorism investigation," prosecutors said. He was suspected of "involvement in preparing a terrorist attack".
In St Peter's Square in Vatican City, worshippers were subject to tight security as they flocked to hear Pope Francis deliver his Easter address. Speaking to the crowed, the Pope called terrorism a "blind and brutal form of violence".
In central Brussels, widespread anxiety was visible as riot police with shields and white helmets fanned around a memorial site for victims. Police briefly fired water cannons after several hundred men dressed in black, apparently football fans, advanced into the area. The fans waved a giant banner against Isis and, according to some media reports, shouted nationalist slogans.
