The suspect is described as being six-feet tall, and having a thin build and a large beard.
No one was hurt in the incident, but patrons quickly scrambled out of the restaurant after the device exploded, according to police and eyewitness accounts.
Witnesses said the suspect opened the door of the crowded restaurant around 6pm on Thursday and lit and threw the homemade device before fleeing towards Fair Oaks Ave.
"It could be a dissatisfied customer, a disgruntled employee", Goodman said, adding that police don't know if the incident is terrorism-related.
"People were jumping over one another, fighting to get over bar stools, people were tripping, falling. stuff going everywhere". No getaway vehicle was seen.
The device contained gunpowder, the Star-News said.
The LA County Sheriff's Bomb Squad and the Pasadena police responded to the scene.
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Khedache, who is known to his fellow criminals and to police as "Old Omar", is now being held without bail. Kardashian-West, 36, has recently returned to social media after a large absence following the incident.
A motive for the incident was unclear.
The man was wearing all black clothing and a black beanie, according to the Police Department.
A spokeswoman for the Cheesecake Factory, Alethea Rowe, gave the following statement to NBC4 Southern California Friday morning.
Tornek said he was driving by the Cheesecake Factory Thursday evening after leaving dinner and saw the police cordoning off the area.
The Pasadena Police Department is handling the ongoing investigation, but the FBI has been notified, KABC reports.
Anyone with information was asked to call the Police Department at 626-744-4241.