Eight people were arrested Monday in El Cajon after an unlawful assembly was declared at the site of last month's fatal police shooting.

El Cajon Police (ECPD) said their officers were assaulted by a crowd of people near the memorial for the man shot and killed Sept. 27 in a confrontation with police officers.

Alfred Olango, 38, was shot and killed in a confrontation with police in the parking lot of a shopping center at Broadway and North Mollison. The shooting led to several nights of protest by members in the community who argued the shooting was unjustified. An investigation has been launched.

A memorial built for Olango in the parking lot had been removed recently. According to ECPD, "participants in the memorial, who had been asked to leave the property, returned and asked to collect their items" prior to Monday's incident.

However, two people who noticed the memorial was gone Monday evening argued with security personnel who have been hired to patrol the area by the property owner. Security employees called ECPD to take the two people into custody.

At that time, three officers and several protesters witnessed a man "brandish a hand gun" according to a police statement.

Traffic Advisory - Protest Activity in the area of Broadway and Mollison. Please avoid the area if possible. — El Cajon Police (@elcajonpolice) October 18, 2016

At approximately 7:30 p.m., police had issued a traffic advisory to motorists to avoid the area.

They also walked through nearby streets looking for the protester who drew the gun as well as those who left the area carrying the firearm, police said. The gun was not recovered.

Booked on trespassing charges were a 28-year-old San Diego man, a 29-year-old San Diego man and a 37-year-old San Diego man

A 22-year-old San Diego female and a 26-year-old La Mesa man face charges of obstructing an officer and trespassing.

A 28-year-old El Cajon man faces charges of refusing to leave an unlawful assembly, destruction of evidence and obstructing an officer. A 25-year-old El Cajon man was booked on a charge of refusing to leave an unlawful assembly.

One man, 21, of El Cajon, was arrested on a felony no bail warrant for assault with a deadly weapon as well as refusing to leave an unlawful assembly, police said.

Olango's sister said she had called for help three times in the span of 50 minutes because her brother needed help. But within minutes of arriving on scene, police shot Olango.

When El Cajon Police officers Richard Gonsalves and Josh McDaniel arrived to the scene, Olango refused to remove his hands out of the pockets of his pants. At one point, he drew a device out of his pocket, which was later identified to be a vaping device. Officer McDaniel deployed a taser at Olango while Officer Gonsalves fired multiple rounds from his gun.