Oklahoma tornado: US soldiers join school search
21 May 2013 Last updated at 16:12 BST
Soldiers have joined the search for survivors at the site of Plaza Towers Elementary School, which was directly hit by a devastating tornado in Oklahoma City.
Footage released by the Oklahoma National Guard shows troops helping firefighters, using heavy machinery and sifting through rubble by hand.
Alastair Leithead reports on the sense of urgency from Oklahoma.