Mexican security forces have released the captured son of drug lord Joaquin 'El Chapo' Guzman from a house where he was briefly apprehended after a shootout.
Security Minister Alfonso Durazo says the decision was taken to protect lives.
Durazo's comments followed an earlier statement that did not fully clarify whether the accused drug trafficker, Ovidio Guzman, was still in custody, following hours of intense gunbattles in the northern city of Culiacan.
Members of the National Guard and army were patrolling in Culiacan when they were fired on from a house.
They repelled the attack and inside the house found Ovidio Guzman Lopez.
The house was then surrounded by heavily armed gunmen who had "a greater force" and authorities decided to suspend the operation, Mr Durazo said.
Videos published on social media showed a scene resembling a war zone, with gunmen, some wearing black ski masks over their faces, riding in the back of trucks firing mounted machine guns as vehicles burned.
People could be seen running for cover as machine-gun fire rattled around them.
Drivers drove in reverse frantically to move away from the clashes. Some drivers rolled under their stationary cars for cover.
State officials asked residents to avoid going out in parts of city.
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