of the front compartment with the first throughgoing hole for gas flow between the front compartment and the atmosphere. A hydraulic piston is carried on the air piston and is displaceable in the hydraulic chamber between an advanced position pressurizing the hydraulic chamber and corresponding to the front position of the air piston and a retracted position corresponding to the rear position of the air piston. A first valve is provided for admitting pressurized air into the rear compartment and thereby displacing the air piston into the front position, simultaneously displacing the hydraulic piston into the advanced position and displacing the working piston into the actuated position. A spring is braced between the housing and the working piston and urges this working piston into its ready position. ThusSpanish police on Monday shot dead a man they suspect was the Islamist militant who drove a van into a Barcelona crowd last week, killing 13 people. Ending a five-day manhunt, police tracked 22-year-old Younes Abouyaaqoub to a rural area near Barcelona. They said they shot him after he held up what appeared to be an explosives belt.

Barcelona attack

Abouyaaqoub had been on the run since Thursday evening, after he drove at high speed into throngs of people strolling along Barcelona's most famous avenue, Las Ramblas, in Spain's worst militant attack in over a decade.

Islamic State claimed responsibility and police believe the attack was planned by a dozen accomplices, including a brother and two first cousins of Moroccan-born Abouyaaqoub.

"The suspect wore what appeared to be an explosive belt. He