ALAMEDA (CBS SF) — A man died in police custody Monday morning, prompting investigations, according to Alameda police.

Officers responded Monday morning at 10:45 a.m. to reports of a man who appeared intoxicated and a suspected theft.

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According to police, when officers found the suspect in the 800 block of Oak Street and attempted to detain him an altercation ensued. Officers said there was a struggle to get the man to put his arms behind his back and the man suffered a medical emergency.

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Police said officers immediately began to administer lifesaving measures. The Alameda Fire Department transported the man to a local area hospital, where he later died.

Authorities have identified the man as 26-year-old Mario Arenales Gonzalez of Oakland. The cause of his death is unknown.

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So far, the Alameda County District Attorney’s Office is investigating the incident and the Alameda Police Department has requested that the Alameda County Sheriff’s Office conduct its own independent investigation.