There has been heavy fighting in northern Mexican city of in Culiacan, the capital of the western state of Sinaloa.
The ferocious gun battle between the security forces and members of the powerful Sinaloa drug cartel started after a failed police operation to capture one of the sons of jailed drug kingpin Joaquin “El Chapo” Guzman.
The state government say Ovidio Guzmán was found in a house by a police patrol on a routine search.
It says cartel members subsequently launched the huge attack in an attempt to wrestle him back from the authorities.
He is wanted in the US on several drug-related charges, Mexican media report. He was briefly detained before being released by the police.
Mexican Security Minister Alfonso Durazo said late on Thursday that armed groups overpowered the security forces, prompting authorities to abandon their attempt to capture Guzman’s son.
He is the son of drug lord Joaquin “El Chapo” Guzmán, who was sentenced to life in prison plus 30 years in the US.
Guzmán, 62, had been found guilty in New York of 10 charges, including drug trafficking and money laundering.
He escaped a Mexican jail through a tunnel in 2015, but was later arrested. He was extradited to the United States in 2017.
Joaquin Guzmán is a former head of the Sinaloa cartel, which officials say was the biggest supplier of drugs to the US.