Surveillance video that investigators believe captured the handoff of an explosive-wired laptop that blew a hole in the side of a Somali jetliner could prove the bombing was an inside job, sources told Fox News.

The explosion on board Daallo Airlines Airbus A321 at 11,000 feet Tuesday killed the suspected bomber, who was sucked out of the plane, and forced an emergency landing.

A source close to the investigation showed Fox News the security video from Mogadishu’s airport, which shows two men, one an airport worker in an official reflective vest, passing the laptop to the bombing suspect in the airport terminal after he passed through a security checkpoint and shortly before he boarded.

The source said investigators, including several from the FBI brought in at the Somali government’s invitation, believe they have identified that all three men. They are believed to be from Hargeisa, in the disaffected area of Somaliland, which has been contesting sovereignty with the Somali government. That is a departure from initial suspicions that the bombing was carried out by the Al Qaeda-linked Islamist terror group Al Shabaab.