Fourteen police officers have been killed and three more wounded in an ambush in the western Mexican state of Michoacan.
Michoacan's state security department said officers had gone to a home in the town of El Aguaje to carry out a judicial order when "several armed civilians fired on them".
In a matter of minutes, heavily armed men in a number of pick-up trucks began shooting and setting the police vans on fire.
The Jalisco New Generation drug cartel is suspected of being behind the attack.
Large placards reading "CJNG" - the acronym belonging to the Jalisco New Generation cartel - were left on police vehicles.

GCC Ministerial Council condemns Iranian aggression
Three Indian seafarers missing after attack on tanker off Oman
Trump says Iran must 'pay the price' for delay on deal
12 killed, 9 injured in Johannesburg shooting, South African police say
Homes set alight in Belfast anti-immigrant protests after 'brutal' knife attack