The Los Angeles Police Department announced Monday night that a memorial to rapper Nipsey Hussle ended in a stampede that injured multiple people, including two critically.

On Monday night, a massive crowd gathered on the streets of south Los Angeles for an unplanned memorial to the rapper. Unfortunately the memorial ended abruptly when the crowd believed to have heard "gunshots," and a stampede occurred.

One person was stabbed and another six people sustained injuries from unknown causes, Los Angeles Police Department public information officer Tony Im told USA TODAY. The number of injured may rise as reports come in, he added.

Here's video from the scene:

Multiple people were trampled and police -- armed with riot gear and batons -- began forming containment lines.

One person was stabbed and another six people sustained injuries from unknown causes, Los Angeles Police Department public information officer Tony Im told USA TODAY. The number of injured may rise as reports come in, he added.

Police spokeswoman Meghan Aguilar said during a news briefing that one police officer was also injured.

"Our men and women are on scene and making every effort to protect everyone in attendance at the Nipsey Hussle vigil," the Los Angeles Police Department tweeted Monday night. "Reports of shots fired at the vigil do not appear to be accurate. We do have injured in the chaos and are attempting to restore order."

The memorial descended into what many are calling "utter chaos." There was "mass panic and chaos" in the area, with about 300 people running from the location at once, she said. It is unclear what, if anything, caused the stampede.

The Los Angeles Fire Department transported 19 patients, a majority of them with "trample injuries," the fire department said.

Two of the injured people are considered "critical."