A senior Egyptian police officer was killed by a bomb placed under his car in a Cairo suburb Wednesday, the latest in a series of targeted attacks on police and the military as Islamic extremist groups keep up a campaign of violence since last summer's ouster of Islamist President Mohammed Morsi.

Brig. Gen. Ahmed Zaki was the second police officer of that rank killed this month in a bombing, a sign of how the violence has shifted from high- profile suicide and car bombings against police installations toward more low-level attacks on individual officers.

Al-Qaeda-inspired groups have claimed responsibility for most of the attacks, avenging the crackdown on Morsi's Islamist supporters in which more than 1,300 people have been killed and thousands arrested. The government says suspected extremists have killed more than 450 policemen and soldiers since July. - AP