MINNEAPOLIS (AP) — Twin Cities airport officials say two planes have been damaged after their wings collided while preparing for takeoff.

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An airport spokesman says the Delta Air Lines planes clipped their wings Wednesday night at Minneapolis-St. Paul International Airport after leaving their gates and getting ready to take off. A Delta 757 was bound for Los Angeles and an Embraer E175 was headed to Louisville, Kentucky.

The spokesman says there were no injuries. The planes returned to their gates and the flights were delayed.

It's unclear what caused the collision.