Saudi Arabia warns of 'oil spot' near decaying Yemen tanker
The 45-year-old Safer, anchored off a Yemeni port since 2015, has 1.1 million barrels of crude on board, and the UN has warned that a rupture or explosion would have catastrophic environmental and humanitarian consequences.
"An oil spot has been observed 50 kilometres (31 miles) west of the vessel inside the transit area of merchant ships," Saudi Arabia's UN Ambassador Abdallah al-Mouallimi wrote in the letter posted on Twitter.
"It is obvious that the tanker has reached a critical state of degradation, and that the situation is a serious threat to all Red Sea countries, particularly Yemen and Saudi Arabia."
Agencies contributed to this report.