BREAKING United flight #UA1594 surrounded by fire crew at Bush Airport in Houston

A flight reportedly leaving for Denver suffered an apparent technical issue on takeoff from Bush Airport in Houston early Monday.

FlightAware.com says United flight 1594 was supposed to take off shortly after 6:30 a.m.

The flight was taxiing when it was surrounded by firefighters and other emergency personnel.

A ladder was put in place, but it did not look like any passengers got off the plane.

Check back for updates.