Read the text. Use the verbs in brackets in the past simple or past continuous to complete the sentences:

LOCAL TERRORISTS AMBUSH ROUTINE PATROL

Four soldiers were injured yesterday because a bomb (explode) near their armored vehicle. The incident (happen) at 4.30 pm while the soldiers (return) to base after a routine patrol. Their vehicle (travel) along the High Street when suddenly they (have) to slow down because a bomb which was hidden in a rubbish bin (explode).