A United Airlines plane that departed from San Francisco International Airport was landed safely in Newark, N.J. after a passenger claimed that a bomb stuffed inside a backpack was on board the aircraft.

The San Francisco Police Department and the airline received word of the alert, but authorities gave the pilots the green light to continue on their scheduled heading.

NBC reported, passengers were not made aware of the bomb threat until the plane touched down on the East Coast.

Arjun Shah said that, "They didn't say anything about this thing."  "I just saw two cops when they landed and they didn't say anything about this."

"It would just create panic on the plane so they did the right thing, I guess," he said.

Sources said that, officers and bomb sniffing dogs searched the plane after it landed in Newark, but they did not find anything.

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