Choppers carrying medical supplies and assistance was called into service after the attack on MP Jo Cox.
The Great North Air Ambulance scrambled two helicopters just after 1pm today carrying trauma teams, specialists and supplies.
Helimed 063 took off from Durham Tees Valley Airport with a trauma team consisting of an emergency department consultant and a paramedic on board.
Helimed 058 in Cumbria, also with a trauma team on board, and carrying a consultant anaesthetist, was put on stand-by.
Both aircraft were carrying blood and plasma carried for use mainly in major trauma blood loss.
Helimed 063 was stood down while on the outskirts of Leeds as it was not needed.