BURBANK, Calif. —

Two Southwest Airlines flight attendants are being treated for injuries after a passenger jet heading to Las Vegas from Southern California took a dramatic plunge shortly after takeoff Friday in response to an alert about a nearby plane, the airline and passengers said.

Southwest flight 1496 was responding to an onboard alert about another aircraft in its vicinity, the Federal Aviation Administration said. The FAA is investigating.

The crew responded to two air alerts that required the pilot to climb then descend, the airline said in a statement. The flight departed from Hollywood Burbank Airport just before noon.

Passengers posted on social media that the plane took a dramatic drop soon after takeoff.

“Pilot said his collision warning went off & he needed to avoid p

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