The Federal Bureau of Investigation (FBI) is working to determine whether a Texas suspect accused of fatally shooting a female Lyft driver before opening fire in a police station on Sunday was inspired by foreign terrorists following the discovery of a cryptic note left in the suspect's vehicle.

Imran Ali Rasheed, 33, reportedly ordered a Lyft share ride before proceeding to fatally shoot the driver, Isabella Lewis, on Sunday in Garland. The suspect would later open fire on the lobby of the Plano Police Department and was subsequently fatally shot by police, Fox4 News reported.

Dean D’Ambroaia, a business owner, captured the appalling attack on security footage and told the media that he wishes he had not witnessed it at all.

"You see this stuff on TV all the time," he said. "And it wasn’t until afterward that I realized that wasn’t TV. It was happening in the back of our building."

Police said no known connection has been established between Lewis and Rasheed. It is unclear what motivated the man to behave erratically after booking the ride, as well as target the police after the incident.

Rasheed was previously the subject of a counterterrorism investigation from 2010 to 2013, but the case was closed after authorities ruled he did not pose a threat to the community, Fox News noted.

"At this point, we do not believe that the suspect, Imran Ali Rasheed, was assisted by others or that others were involved in these incidents," the FBI’s Dallas Office said in a tweet on Monday. "It is our top investigative priority to fully determine the extent of his relationships and contacts."

According to Matthew DeSarno, special agent in charge of the FBI branch, the shooter left a letter indicating he "may have been inspired by a foreign terrorist organization" after police found a note in the stolen car that appeared to be from Rasheed.

However, police refused to reveal any more details or name the terrorist group which allegedly inspired Rasheed to commit the crime.

Dallas FBI’s Joint Terrorism Task Force has joined in the probe by the Plano and Garland Police Departments to see what led to the murder as they dig deeper into Rasheed's activities in the lead up to the murder and the attack on cops, according to CBSDFW.

Authorities are now looking into whether the shooter had acquired media content and other inspirational materials promoting others to commit terrorist acts from groups such as the ISIS snd al Qaeda of the Arabian Peninsula, which has been recently very active on the Internet to recruit more followers.

A Lyft passenger has been accused of murdering a driver of the carpool service before proceeding to then drive the still-bloodstained vehicle to travel to a family function in Indianapolis on Thursday, June 30. This is a representational image. Isaac Brekken/Getty Images

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