A container ship caught fire in Dubai at one of the region’s biggest ports, causing an explosion that rocked the city just after midnight local time.

The fire at Jebel Ali Port—the largest in the Middle East and a key center for trade in the United Arab Emirates—is under control and no causalities have been reported, authorities said. The incident occurred on board a ship with a capacity of 130 containers.

Authorities are investigating the cause, Al Arabiya reported. Dubai Police told the network the fire may have been caused by “friction or high temperature,” and no radioactive materials were on board.

“We are taking all necessary measures to ensure the normal movement of ships in the port continues without any disruption,” Dubai Media Office said, citing Jebel Ali Port authorities.

The port is operated by DP World, which wasn’t immediately available for further comment when contacted by Bloomberg.