The United States military command in Europe announced on Friday that security forces at the Lakenheath air base east of Britain responded to suspected unauthorized drone activity in an incident that came days after the United States military moved more than a dozen aircraft from another base in the area because of a security threat.

The United States military command in Europe announced on Friday that security forces at the Lakenheath air base east of Britain responded to suspected unauthorized drone activity in an incident that came days after the United States military moved more than a dozen aircraft from another base in the area because of a security threat.