The idling presence of anti-submarine military crafts hovering off the United States' West Coast has prompted concerns of a possible threat to national security.

Concerns have circulated that a foreign submarine from North Korea or Russia could be the reason for the unusual military activity off the coast of California.

Three low-lying military aircraft were reportedly seen in the area using flight-tracking software, despite it not being a normal area of surveillance.

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The idling presence of anti-submarine military crafts hovering off the United States' West Coast has prompted concerns of a possible threat to national security

Concerns have circulated that a foreign submarine from North Korea, Russia or Iran could be the reason for the unusual military activity off the coast of California

Among aircraft seen were the Navy EP-3E Aries II, which is used for electronic surveillance, a Navy P-3C Orion, used for submarine spotting, and a Boeing P-8 Poseidon used for anti-submarine warfare, InfoWars reported.

The military vessels were allegedly seen spanning the coastal waters from Los Angeles to the San Diego/Tijuana border near Mexico.

The website stated that a Royal Canadian CP-140 Orion, which is also known for its capability to spot submarines, entered the area at one point.

Among aircraft seen were the Navy EP-3E Aries II, which is used for electronic surveillance

A Boeing P-8 Poseidon used for anti-submarine warfare was spotted idling

A Navy P-3C Orion, used for submarine spotting, was reportedly lying low on the California coast

Though the reports remain unconfirmed, they come in the wake of a tumultuous week for the United States' foreign activity, after President Trump launched 59 tomahawk missiles at a Syrian air base on Friday.

The action was said to have infuriated Moscow and Russian government.

According to the Sun, Russia and Iran made a joint statement, which read:'What America waged in an aggression on Syria is a crossing of red lines.

'From now on we will respond with force to any aggressor or any breach of red lines from whoever it is and America knows our ability to respond well.'

North Korea also made inflammatory responses after the U.S. deployed an armada of warships to waters off the Korean Peninsula, and said they were 'ready to react to any mode of war'

North Korea also made inflammatory responses after the U.S. deployed an armada of warships to waters off the Korean Peninsula.

A spokesman for the Democratic People's Republic of Korea (DPRK) foreign ministry said: 'This goes to prove that the U.S. reckless moves for invading the DPRK have reached a serious phase.

'The DPRK is ready to react to any mode of war desired by the U.S.'