Authorities searched for clues Monday into a possible link between the ambush-style killings of four Muslim New Mexico men over a nine-month period.

Albuquerque homicide detectives suspect there could be a connection between the shooting of a man Friday night and two other men killed over the past week in separate incidents. The two men, both from Pakistan, attended the same mosque, according to authorities. 

Investigators think the same person may have committed the crimes, said Kyle Hartsock, deputy commander of Albuquerque Police Department’s Criminal Investigations Division.

“While we won’t go into why we think that, there’s one strong commonality in all of our victims: their race and religion,” Hartsock said in a statement.

The slayings have left many on edge.

“This has just rocked our community,” Mariam Alabdali, a representative from the Lighthouse of New Mexico Muslim Community Center in Albuquerque, told USA TODAY.

The FBI joined the investigation into whether the three killings could be tied to the slaying of another Muslim man in November.

A Volkswagen Jetta could be the clue investigators need to link the slayings. They seek the public’s help in tracking it down.

Here’s what we know:

Who were the victims?

Mohammad Ahmadi, a Muslim man from Afghanistan, was killed Nov. 7 outside the Albuquerque business he and his brother ran, authorities said. Police found Ahmadi, 62, shot to death in the building’s rear parking lot. 

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Aftab Hussein, 41, and Muhammed Afzaal Hussain, 27, from Pakistan were slain in southeast Albuquerque. Hussein was killed July 26, and Hussain on Aug. 1. Investigators said they have determined a link between the killings.

The fourth victim, Naeem Hussain, was fatally shot before midnight Aug. 5, according to investigators. Hussain, 25, was also from Pakistan.

How are authorities responding to the crimes?

The Albuquerque Police Department launched an online portal for members of the public to submit photos or videos that could help detectives investigate the four Muslim killings. 

Authorities seek the public’s help locating a vehicle that could be connected to the slayings.