Traffic on the single bridge that links Russia to Moscow-annexed Crimea and serves as a key supply route for the Kremlin’s forces in the war with Ukraine came to a standstill on Monday after one of its sections was blown up, killing a couple and wounding their daughter.

The RBC Ukraine news agency reported that explosions were heard on the bridge, with Russian military bloggers reporting two strikes.

RBC Ukraine and another Ukrainian news outlet Ukrainska Pravda said the attack was planned jointly by the Security Service of Ukraine (SBU) and the Ukrainian navy, and involved sea drones.