ARABIC speakers escorted off a flight by police, planes searched on the tarmac and airports evacuated as US security goes on high alert after the Boston bombings.

United States security is on high alert after two explosions ripped through the Boston Marathon killing at least three people and injuring more than 170.

At Logan International Airport in Boston two men who were not seated together started speaking Arabic, My Fox Boston reported. That was enough to have them removed from the plane.

“There were some concerned marathoners on the flight so the plane was brought back to the gate and the two men were escorted off the plane,” My Fox reports.

Transport Safety Authorities also stopped Flight 1716 from Philadelphia on the tarmac soon after landing. The luggage was laid out piece by piece on the runway until each bag was searched and cleared.

Federal Aviation Authority spokesman David Procopio said a piece of luggage on the plane had not been checked in Philadelphia that security wanted to inspect.

United Airways Flight 636 to Chicago was also returned to the gate and passengers were sent back through security screening at the request of the crew while the aircraft was swept.

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