Gunmen opened fire on a police patrol, killing four officers and wounding three others in northwestern Pakistan on Tuesday.
According to reports, six to seven men were waiting at a local tea stall before they opened fire at the vehicle.
No group has claimed responsibility for the attack so far.
It's the first major attack in Dera Ismail Khan district since a political candidate was killed in the lead-up to Pakistan's general election in July.

Kenya tourist helicopter crash kills seven
US, South Korea to cut length, scope of military drills after Trump order
Central African Republic gold mine collapse kills at least 100
Israeli airstrike kills nine Palestinians at Gaza police station
Thai schools hold shooting response drills after deadly school attack