PESHAWAR, Pakistan (AP) — A suicide bomber and several gunmen detonated an explosives-laden vehicle near a security post in northwest Pakistan late Saturday, triggering an intense firefight that killed at least three police officers, police said. The attack took place in Bannu, a district in Khyber Pakhtunkhwa province bordering Afghanistan, police official Zahid Khan said. He said multiple explosions were heard shortly after the attack and that several nearby houses and the security post