In the cable, King Abdullah condemned the cowardly act, affirming Jordan's solidarity with Egypt in efforts to fight terrorism and safeguard its stability and security, according to a Royal Court statement.

The king expressed sympathies to the people of Egypt and wished the injured a speedy recovery.

Twenty people were killed and 47 were injured in a multi-vehicle crash and an ensuing explosion on Monday that forced the partial evacuation of the nearby National Cancer Institute, Egypt's Health Ministry said in a statement.