Ten US Navy sailors are missing after an American warship collided with a merchant ship east of Singapore.

The USS John S. McCain collided with the oil tanker Alnic MC on Monday morning local time while the guided-missile destroyer was passing near the Malacca Strait to make a port visit in Singapore , the Navy’s 7th Fleet said in a statement.

The collision marked the second accident involving US Navy destroyers in Asian waters in over two months.

“Initial reports indicate John S. McCain sustained damage to her port side aft,” the Navy said as a search-and-rescue mission was underway. “The ship was transiting to a routine port visit in Singapore.”

“There are currently 10 sailors missing and five injured… Search and rescue efforts are underway in coordination with local authorities,” the Navy statement said.

Trump sends ‘prayers’ to US sailors in crash

US President Donald Trump on Sunday night tweeted his “thoughts and prayers” to the sailors aboard the warship.

“Thoughts & prayers are w/ our @USNavy sailors aboard the #USSJohnSMcCain where search & rescue efforts are underway”, Trump said in a post which contained a link to the US military’s announcement about the crash.