Heavily armed gunmen waged an all-out battle against Mexican security forces on Thursday after they moved to arrest a son of jailed drug kingpin Joaquin "El Chapo" Guzman in his home state, Sinaloa.
Cartel gunmen then "surrounded the house, outnumbering the soldiers", and began a massive assault on various parts of the western city, Durazo said.
According to Mexican media reports, that included freeing Ovidio Guzman and retreating from the house.
Gunmen blocked roads and highways around the city into the evening, bringing the city of 750 000 people to a standstill, AFP journalists said.
The state government said it was "working to restore calm and order in the face of the high-impact incidents that have occurred in recent hours in various points around Culiacan".
However, his cartel remains one of the most powerful in Mexico.
He is considered the most powerful drug lord since Colombia's Pablo Escobar, who was killed in a police shootout in 1993.
Reports that Ovidio had been arrested and then freed triggered harsh criticism of Obrador's security strategy.
Mexico has registered more than 250,000 murders since the government controversially deployed the army to fight drug cartels in 2006.