On April 15, the 45 meter long tanker Wan Da capsized and sank in the Malacca Straits near Johor, Malaysia. All the crew on board the Wan Da were able to escape before the vessel rolled over. Malaysian patrol vessels monitored the overturned tanker as it drifted across shipping lanes into Indonesian waters. Reports state Indonesian patrol vessels had secured a tow line to the Wan Da and tried to tow the tanker towards Riau Islands. Another report states the Wan Da sank before it could be towed to safety. Authorities state an oil spill was spotted off Tanjung Penyusop.