ADEN - Yemen's army killed at least five al-Qaida-linked militants in Abyan province on Wednesday as it continues a US-backed offensive to suppress Islamist militancy in the south, a military official said.The Ministry of Defense said in a text message that some of the dead militants had been senior military leaders of Ansar al-Sharia, which has close links to the Yemen-based al-Qaida in the Arabian Peninsula (AQAP).Earlier in the day, a Yemeni aid worker for the International Committee of the Red Cross was killed by an air strike in the province while carrying out humanitarian work, the agency said.A local official told Reuters on Wednesday that the ICRC worker had been killed in a strike by the Yemeni air force.