US military bases across country ordered to step up security

US Northern Command, which oversees the defence of North America, has ordered military installations to put in place 11 additional “force protection” measures to strengthen security, the command said.

The additional measures were ordered “based on world events” to “enhance vigilance” and protect personnel and installations, the command said in a statement to CNN.

The added steps set a minimum level of security across installations, though local commanders can impose steps to increase security, a spokesperson told CNN.

At least four US service members have been killed since the conflict began over the weekend, after US and Israeli strikes on Iran.