Mexican authorities arrested Ovidio Guzmán, the son of notorious drug lord Joaquin "El Chapo" Guzmán. The arrest was made in an operation in the state of Sinaloa on Thursday, a source from Mexico's federal government told CNN.
He is thought to be a high-ranking member of the Sinaloa cartel - one of the world's largest drug-trafficking organisations.
Ovidio Guzmán was previously arrested by federal authorities in October 2019, but was released by order of President Andrés Manuel López Obrador to avoid further bloodshed.
"El Chapo" Guzmán was convicted in the United States in 2019 of 10 charges, including involvement in an ongoing criminal enterprise, drug trafficking and firearms charges. He was sentenced to life in prison plus 30 years and ordered to pay $12.6 billion in forfeiture.
Gunshots and car attacks have been reported in the city, the BBC reports.
Mayor Juan de Dios Gamez confirmed on Twitter that the federal armed forces have been conducting an operation in Culiacán since dawn on Thursday and that this has caused violence in the city and other parts of the state.
"We ask the citizens of Culiacán not to leave their homes because of the blockades that have occurred in different parts of the city," he said.
The local airport is reported to be temporarily closed, and the local government body that oversees education announced on social media that "teaching and other administrative activities" were suspended in Culiacán.

Details about today's operation
At approximately 4:00 a.m., a military operation was launched aimed at capturing the son of El Chapo, one of the leading figures within the Sinaloa cartel, Ovidio Guzmán, borderlandbeat reports.
The army (SEDENA) was allegedly the main military group involved in the operation. The Marines (SEMAR) are the military group most often used for such high-profile targets, so the choice to use SEDENA seems significant. The Air Force and the National Guard also participated in the arrest.
Soldiers moved to capture Ovidio from a property in the neighborhood of Jesús María, near the towns of Guasave and Los Mochis.
Neighbors allegedly started hearing gunshots at 4:40 a.m., according to Reforma newspaper.
Helicopters were reportedly used and Special Forces units from airborne divisions participated in the capture.
In total, 900 operatives of SEDENA, the Air Force, the National Guard and the Sinaloa State Police are involved in the operation, although most of them were likely notified after the arrest was completed to prevent details of the operation that could were given to members of the Sinaloa Cartel.
Journalist Jorge Sánchez Torres reported that an exchange of gunfire was heard near the prison in Culiacán, called Aguarato, which contains a significant number of "soldiers" of the Sinaloa Cartel.