The USS John S. McCain, a guided-missile destroyer, was involved in a collision early Monday with a oil tanker east of Singapore and the Strait of Malacca resulting in damage to its port side aft (left rear), according to the U.S. Navy.

Search and rescue efforts are underway, U.S. Navy's 7th Fleet says. Officials say 10 sailors are missing and five are injured.

The Singaporean Navy is sending assets to assist and the USS America is en route to help. The collision was reported at 6:24 a.m. Japan Standard Time, according to the U.S. Navy.

"In addition to tug boats out of Singapore, the Republic of Singapore Navy ship RSS Gallant, RSN helicopters and Police Coast Guard vessel Basking Shark are currently in the area to render assistance," the Navy's statement read.

USS John S. McCain is sailing under her own power and is heading to port, the Navy added.

Senator John McCain sent the following message on Twitter in response: "Cindy & I are keeping America's sailors aboard the USS John S McCain in our prayers tonight."

President Trump reportedly was informed of the collision and responded by saying "that's too bad," according to a print journalist part of the pool traveling with the commander-in-chief.

Meanwhile, Mr. Trump took to Twitter late Sunday to offer condolences to those affected by the collision: