Five people have been killed in two separate explosions in Iran which local officials and state media say were caused by gas leaks. One person was killed and 14 injured in a blast at a residential building in the southern city of Bandar Abbas on the Gulf coast, a local official told Iran's semi-official Mehr news agency. Another explosion killed four people in the south-western city of Ahvaz, the state-run Tehran Times reported. In the port city of Bandar Abbas, state TV said the explosion had ripped through an eight-floor building, 'destroying two floors, several vehicles, and shops' in the Moallem Boulevard area. The local fire department chief Mohammad Amin Liaqat said a preliminary assessment showed it had been caused by a gas leak and 'build-up'. Meanwhile, semi-official news agency Tasnim denied social media reports that a Revolutionary Guards navy commander had been targeted in the blast. The explosions come at a time of heightened tensions in the region, especially following the build-up of US forces in the Gulf and demands from President Donald Trump for Tehran to agree on its nuclear program. Iran insists that its nuclear ambitions are for peaceful purposes only, rejecting claims that it is pursuing nuclear weapons.