July 8 (Reuters) - A United Airlines jet lost a

main landing gear wheel while taking off from Los Angeles, it

said on Monday, months after a similar incident at the carrier

involving a Boeing ( BA ) jet.

The United Flight 1001, a Boeing 757-200, safely

landed in Denver after losing one wheel on takeoff, the carrier

said in an emailed statement.

"We are investigating what caused this event" United said,

adding there were no reported injuries on the aircraft or on the

ground.

Boeing ( BA ) in an emailed response said it had ended

production of the 757 in 2004.

In March, United's Boeing B777-200 jet lost a tire mid-air

following takeoff from San Francisco.