The Navy will investigate whether two US destroyers were hacked before they collided with merchant ships in a pair of recent crashes, according to a top Navy admiral.

“2 clarify Re: possibility of cyber intrusion or sabotage, no indications right now…but review will consider all possibilities,” tweeted Admiral John Richardson , referencing sweeping new investigations announced Monday into two recent accidents involving Naval warships in the Pacific.

The latest incident came Monday, when the USS John S. McCain collided with a Liberian oil tanker near Singapore, leaving five sailors injured and 10 missing.

It was the second time a US destroyer ran into a commercial ship in recent months.

A Philippine merchant boat rammed the USS Fitzgerald June 17, killing seven US sailors. Officials said nearly a dozen sailors, including the boat’s commander and two other ranking officers, would be punished for committing a “slew” of mistakes in the moments leading up to the crash.

Both destroyers are part of the Navy’s 7th Fleet, which is based in Yokosuka, Japan, and patrols the waters around China and North Korea.

China’s government rebuked the US Aug. 10 because the USS MCCain sailed too close to man-made islands in waters it claims to control.