The death toll from a Houthi attack on a training camp in Yemen has risen to 73. The strike hit the al-Alam training camp in Shabwa province, in the country's south. Those killed were recruits between 18 and 20 years old, according to the report. Some recruits were still missing a day after the attack, so the final number may change. The Houthi rebels are backed by Iran, and the assault has been described as the deadliest in months. The report did not say whether any of the missing recruits were found alive.