"We have successfully taken the suspect into custody without incident. The situation remains fluid as officers move forward clearing the location," police said on Twitter.
According to CNN, the man reportedly shot his grandmother and a younger female and crashed his grandmother's car during a police chase before running into the store.
"(The suspect) jumped out of the car and it looked like he shot some rounds off when he got out of the car," Dan Zito, who said he was only feet away from the crash, told NBC LA. "And (the police) returned some fire at him, but he ran straight in [to the Trader Joe's]."
Per the Times, officers did fire on the suspect before he entered the building, however, it's unclear if he was wounded.
Images surfacing on social media have shown officials successfully removing those inside the Trader Joe's as others walk out of the establishment. One customer has reportedly been removed from the store with injuries that required immediate medical attention, NBC Los Angeles reported.
The Los Angeles Police Department have urged residents to "stay clear of the area." The incident took place near the intersection of Hyperion Ave and Griffith Park Blvd. Police have initiated a tactical alert in order "to ensure all resources necessary will be available."
US President Donald Trump tweeted late Saturday that he is keeping tabs on the incident and that LAPD officials are "working with Federal Law Enforcement."
A woman has been killed in the Trader Joe's grocery store in Los Angeles after an armed man had barricaded himself inside the store, local media reported citing Los Angeles Mayor Eric Garcetti.
According to the CNN broadcaster, a video shot from a helicopter also showed officers carrying a person who was apparently injured.