In early February, Israel sent six quadcopter drones containing explosives into a facility near the city of Kermanshah that was Iran's main manufacturing and storage plant for military drones, according to a senior intelligence official briefed on the operation. That Israeli attack destroyed dozens of Iran's drones. Iran retaliated by firing ballistic missiles at a housing complex in northern Iraq that it said had been used by Israeli agents to plot attacks against Iran. In June 2021, another attack using a quadcopter drone -- which explodes on impact -- was also launched from within the country. It struck the Iran Centrifuge Technology Company, or TESA, in the city of Karaj.