Mercedes-Benz has introduced an special armour protected option for its S 600 luxury sedan. The S 600 Guard protects against military-grade small arms fire, hand grenade shrapnel and other explosive devices, according to a statement. Additional security features include tyres with run-flat properties, a self-sealing fuel tank, and an alarm system. The vehicle is powered by a 517 bhp 12-cylinder bi-turbo engine.