Enrique Zavala Zamudio, 19, and Joel Chavez Zavala, 21, died at the scene from their gunshot wounds.

Two people were killed and four were injured after two gunmen opened fire on a group of people barbecuing in Greenfield on Sunday, police said.The shooting took place at about 7:40 p.m. at 438 Calaveras St.Witnesses said they saw two Hispanic men in their late teens or early 20s walking in the neighborhood and looking “suspicious” just minutes before gunfire rang out, police said.Enrique Zavala Zamudio, 19, and Joel Chavez Zavala, 21, died at the scene from their gunshot wounds.The other four victims were brought to local hospitals.As of 5:30 a.m. Monday, two of the victims had been released from area hospitals, while the other victims were in stable condition.The two alleged gunman fled the scene on foot and are currently on the loose, officials said.Police said the two men may have gotten into a brown GMC Yukon or a Chevrolet Blazer, but no license plate was seen.