CNN  — 

The potentially linked ambush-style shootings of three Muslim men and the recent killing of a fourth in Albuquerque have alarmed the city’s Muslim community, leaving the community grappling with fear as police announce they have detained a suspect.

The killings of Mohammad Ahmadi, 62, Muhammad Afzaal Hussain, 27, Aftab Hussein, 41, and Naeem Hussain, 25, all have one commonality: the victims were all Muslim and of South Asian descent, according to Albuquerque police.

The three most recent killings happened within the span of two weeks, putting the city on edge as police probed for potential links between the attacks, and put a spotlight on an unsolved homicide from November 2021.

Albuquerque police announced Tuesday they had arrested 51-year-old Muhammad Syed, who they described as the “primary suspect” and the driver of a dark silver sedan-style vehicle authorities previously described as a “vehicle of interest.”

The suspect is being charged with two of the homicides: the July 26 killing of Aftab Hussein and the August 1 killing of Muhammad Afzaal Hussain.

The FBI is assisting with the investigation, and an online portal was set up for residents to upload videos and images which might help authorities investigating the killings. The local Crime Stoppers Board has also voted to increase a reward for information leading to an arrest to $20,000.

“While we are still sifting through all the evidence to look for more connections, it is deeply troubling that these three men were Muslim and of similar descent,” deputy commander of Albuquerque Police Department’s Criminal Investigations Division, Kyle Hartsock, previously said.

Here’s what we know about the killings and the investigation so far:

How did the killings happen?

The most recent of the killings was reported Friday, when Naeem Hussain was found dead by Albuquerque police officers who responded to reports of a shooting just before midnight in the area of Truman Street and Grand Avenue.

After the discovery, Albuquerque police said the homicide “may be connected” to three previous killings of Muslim men from South Asia.

Those three men – Muhammad Afzaal Hussain, Aftab Hussein and Mohammad Ahmadi – were all “ambushed with no warning, fired on and killed,” Hartsock previously said.