Deadly explosions caused by gas leak killed during the night at least 25 people and injured 257 in Kaohsiung city of Taiwan. Underground explosions caused fires that had pushed up manhole covers in the streets and created craters on major highways. Streets were filled with flames, cars were overturned and homes collapsed. Many roads are still impassable and full of rubble. The authorities are still unable to determine what sparked the explosion, Although the initial investigation showed that responsible a leak in an underground pipe that carries propene, an extremely flammable and virtually odorless petrochemical used for polyester. The Kaohsiung is one of petrochemical production centers in Taiwan.