Islamabad, Pakistan (CNN) -- Eleven soldiers were killed Friday when about 150 militants fired at five security forces checkpoints in the northwest Pakistan tribal region, a government official said.
The attack injured 12 others, said Amjad Ali Khan, the government official in Mohmand Agency.
It happened in Mohmand Agency, one of seven districts bordering Afghanistan.
Twenty-four militants were killed, and the rest fled, said two military officials.
The officials asked not to be named because they are not authorized to speak to the media.
In a separate attack Friday, a roadside bomb blast killed a police officer and wounded three others in Quetta, police said.
The bomb -- planted on bicycle -- exploded when a patrolling police van was passing by, according to Malik Muhammad Iqbal, police chief of Baluchistan province.