Kabul, Afghanistan (CNN) At least 34 people were killed Thursday when two suicide bombers attacked a convoy of buses carrying newly graduated police officers in Afghanistan, authorities said.

The dead include 30 officers and four civilians, said Musa Rahmati, the Paghman District chief.

An additional 60 people were wounded in the attack west of Kabul.

One attacker was on foot, and the other was in an explosives-packed car, Rahmati said.

They attacked five buses carrying 219 police graduates who were traveling to Kabul from a police training center in neighboring Wardak province.

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