VIDEO: Alaska Airlines plane damage

(NBC) - An Alaska Airlines flight from Seattle to San Diego was forced to turn back shortly after departure Monday and make an emergency landing after an engine cover detached. 

An Alaska Airlines flight was forced to make an emergency landing Monday after an engine cover detached.

Alaska Airlines said flight 558 from Seattle to San Diego reported an "unusual vibration" on the left side of the aircraft shortly after departure and had to return to Seattle-Tacoma International Airport.

In dramatic video shared with NBC News the cowling of an engine can be seen flying off as the plane appears to land.

176 guests and 6 crew members were on the flight at the time.

Alaska Airlines said no one was injured and passengers were rebooked on another flight.

The aircraft, a boeing 737-900er, is now temporarily out of service while the airline's safety team investigates.

The FAA also said it will investigate.