ANTIOCH (CBS SF) — Two separate shootings in Antioch Monday morning left two people dead and another person injured, according to authorities.

In the first case, gunfire ended a gathering inside an Antioch apartment with one man killed, a second man hospitalized and the suspected gunman still at large, Antioch police said.

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Officers responded at 1:33 a.m. to the Twin Creeks apartment complex at 1111 James Donlon Blvd. on a report of gunshots heard near an apartment.

Arriving officers found a 36-year-old man down on the ground in the back patio of a unit with a gunshot wound. He was pronounced dead at the scene and his name is not yet being released.

A second victim, a 23-year-old man, was taken by paramedics to a hospital where he was listed in stable condition Monday morning, according to police.

Investigators have learned there were several people inside the apartment when an altercation occurred and a male suspect then fired several gunshots and fled the complex on foot.

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The suspect remains at large and there was no description of him immediately available from police.

Later Monday morning, an argument between roommates turned deadly when one of the roommates shot the other, police said.

Officers responded around 8:30 a.m. to a report of a shooting at a home in the 1900 block of Iron Peak Court and found a 43-year-old man who was pronounced dead at the scene. His name has not yet been released, according to police.

The other roommate, also a 43-year-old man, was being interviewed by police as of late Monday morning, police said.

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Anyone with information about the shootings was asked to call the Antioch police non-emergency line at (925) 778-2441.