El Chapo: Mexican police capture then release drug boss's son after battle with cartel

Security minister says decision not to detain Ovidio Guzmin Lopez was made to protect citizens, after heavy gunfire

Intense fighting has erupted in the Mexican city of Culiacin, where masked gunmen threw up burning barricades and traded gunfire with security forces after the arrest of one of the sons of the jailed former leader of the Sinaloa drug cartel Joaquin "El Chapo" Guzmin.

Images shared on social media showed trucks with mounted heavy machine guns patrolling the city streets. Another clip showed a gunman with an assault rifle shooting at an unknown target against a soundtrack of continuous gunfire.