Singapore’s minister for transport says port congestion played no part in Friday’s collision between two vessels that resulted in a major oil spill.

“Some members of the public have asked if this incident was due to congestion in our port waters,” Chee Hong Tat said in a posting on Facebook.

“Investigations are still ongoing, but preliminary findings show that the allision on 14 June was caused by the dredger experiencing sudden loss of engine and steering controls.”