Israeli police have arrested 12 people on suspicion of arson over a series of wildfires that have burned around the country for four days. <br/><br/>Firefighters have brought a blaze under control around the northern city of Haifa, where about 80,000 people were ordered to evacuate. But officials say several smaller fires are still being tackled in different locations. <br/><br/>The blazes have been fanned by hot, dry weather and high winds. Several people have been treated for smoke inhalation but no serious injuries have been reported.<br/><br/>Israeli Prime Minister Benjamin Netanyahu said that if any of the fires were started deliberately they would be treated as an act of terrorism. <br/><br/>Education Minister Naftali Bennett, leader of the right-wing Jewish Home party, hinted at Arab or Palestinian involvement.Palestinian President Mahmoud Abbas's Fatah movement said Israeli officials were exploiting the fire to accuse Palestinians.<br/><br/>Despite the fire around Haifa calming, fire officials warned it would be several days before they could fully extinguish what remains of the blaze. A US supertanker, capable of carrying 74 tonnes of water and fire retardant, is due to arrive in Israel today to assist. <br/><br/>Several other countries – including Cyprus, Russia, Italy, Croatia and Greece – have also sent help and equipment, including aircraft, to help tackle the blazes.