Two men were killed and another two were injured in an East Baltimore shooting early Saturday, Baltimore Police said.

Officers responded to the 900 block of Greenmount Avenue to investigate a ShotSpotter alert around 3 a.m., police said.

They found a 20-year-old man, a 21-year-old man and a 29-year-old man with gunshot wounds.

All three were taken to local hospitals, where the 29-year-old man and 21-year-old man died. The 20-year-old man’s injuries are not life-threatening, police said.

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During the investigation, officers learned of a 19-year-old who walked into a hospital after he was shot. The teen is in critical condition, according to authorities.

Investigators believe a verbal dispute led to a physical altercation, and then shots were fired, police said.