At least 15 people were killed in a rocket attack, executions carried out by suspected Taliban militants, and bombardment by warplanes in north-west Pakistan, officials and media reports said on Sunday. Islamist insurgents fired four rockets on various locations in Bannu district of North-West Frontier Province (NWFP) late Saturday, according to The Associated Press. "Two of these were aimed at city police station but they missed the target and hit a construction company office. Two of its employees were killed," said a local police officer Zaheer Ahmad. The other two landed close to a private hospital and in a football ground, causing no damage. Bannu borders the troubled North Waziristan tribal district, a sanctuary of pro-Taliban militants and al-Qaeda fighters, who launch cross border attacks on NATO-led international forces as well as target Pakistani police and military targets. The authorities in North Waziristan discovered on Sunday the bodies of two men shot dead by militants on suspicion of spying for US forces, a local security official said. "Anyone spying for the Americans will meet the same fate," read a note left with the dumped bodies. Pakistani jet fighters pounded various hideouts of rebels in another Bajaur tribal district, leaving four Taliban and a civilian dead.