The issue focused on allegations that hackers hacked computers from IBM's servers and smartphones in Russia. Microsoft declined to comment.

Microsoft confirmed Tuesday it had hired cyber security experts from Computerworld. IBM did not immediately respond to requests for comment.United Nations monitors drones flying over Yemen have captured footage showing helicopters hovering above residential buildings as Yemeni civilians flee violence there.

Local residents reported drones buzzing overhead while nearby civilian homes were evacuated after airstrikes hit neighborhoods near mosques. The drone cameras appeared to record shots of vehicles approaching