(CNN) -- Investigators are searching for an Afghan National Army soldier who shot a rocket at British soldiers in Helmand province, killing three and injuring four others early Tuesday morning, an Afghan Defense Ministry spokesman said.
"We believe these were the actions of a lone individual who has betrayed his ISAF and Afghan comrades," a U.K. military spokesman said. "His whereabouts are currently unknown but we are making strenuous efforts to find him".
