Thousands attended a funeral service for those killed in an attack after gunmen targeted a group of Coptic Christians traveling to a monastery in central Egypt, killing 28.

The funeral turned into an angry protest against what mourners said was the authorities’ failure to protect Christians.

Eyewitnesses said masked men opened fire after stopping the Christians, who were in a bus and other vehicles on a desert road.

Local TV channels showed a bus apparently raked by gunfire and smeared with blood.