CAIRO — A dozen masked attackers fired birdshot late Saturday at protesters who have camped outside Egypt’s presidential palace in Cairo for the past month, wounding several along with security forces standing watch nearby, witnesses said. It was the latest in a series of shootings of protesters in Egypt.

Paramedic Mohammed Sultan put the total number of wounded in the attack at 15, including nine members of the security forces and six protesters.

The witnesses said attackers also threw Molotov cocktails at protesters’ tents, setting some on fire.