The 200 meter long, 30250 dwt container ship Wan Hai 301 allided with the docked 267 meter long, 55612 dwt container ship APL Denver at Johor Port in Pasir Gudang, Singapore. The Wan Hai 301 had lost control in the port when the vessel suffered power blackout after its generator failed. The Wan  Hai 301 bow struck the APL Denver amidship resulting in hull damage to the APL Denver.

The hull was holed at the waterline allowing some water ingress. The allision also punctured a starboard fuel tank on the APL Denver spilling some 300 tons of oil into the sea.  

Local authorities responded and placed booms to protect nearby mangroves. Reports state pollution has impacted a nearby fish farm and may have contaminated fish stocks. Additionally, booms were placed near reservoirs to prevent oil residue entering the system. No reports of injuries on either vessel.