Knife attacks on Egypt churches.
One person has been killed and at least 12 others injured by knife-wielding attackers at three churches in northern Egypt, police have said.
The attacks happened in Coptic churches in the city of Alexandria.
The simultaneous incidents took place during Friday Mass. Police say they have the three men in custody.
Witnesses said clashes erupted between Christians and Muslims outside the churches, the Associated Press news agency reported.
Hundreds of Christians had gathered outside the churches in protest at the attacks, the agency said.
According to police reports, two people armed with knives attacked three churches. A third man was prevented from entering another church by security guards.
The identity of the attackers is not known.
An employee at one of the churches told the AFP news agency that people inside the church had fought back with sticks, but that the attacker had tried to escape through an underground passage.