A Suez canal tugboat sank, and a crew member was missing after it collided with a Hong Kong-flagged tanker, the authorities in charge of the waterway said.

The Guardian reports that a salvage team located the wreckage after the accident on August 5 and the waterway was being cleared. The team rescued six of the seven crew from the sunken tugboat and a search was ongoing for the missing crew member, the Suez Canal Authority said.Northbound traffic was briefly interrupted but southbound vessels were not affected, it said.

The vessel involved in the collision was the Hong Kong-flagged LPG tanker Chinagas Legend, which was heading from Singapore to the U.S. The 755-foot ship was carrying 52,000 tonnes of liquefied petroleum gas.