Mass shooting at a shopping mall in US, four dead

Jacksonville : Four out of 15 people have been shot dead in mass shooting on Sunday in downtown Jacksonville, Fla., at a popular shopping center filled with bars and restaurants. 11 people are being treated in a hospital.

According to reports, the suspect shooter has also been killed in the firing incident at a video game event held at Jacksonville Landing, Madden NFL Championship Series.

One witness at the gaming event told Fox News that someone who was competing in the tournament lost and "went crazy and started shooting up the room."

Cops are still investigating a motive behind the shooting; details of the suspect have also been kept confidential so far.

The sheriff's office did confirm one suspect "is dead at the scene." Officials added it's "unknown at this time if we have a second suspect. Searches are being conducted."

The Jacksonville Sheriff's Office said on Twitter that the shooting took place in Jacksonville Landing, a downtown market place, and warned everyone to stay "many blocks" away from the area, as the area "is not safe at this time", Xinhua reported.

Police did not provide further information, but said they "can’t stress enough to stay away. Many blocks away," adding that "If you are hiding in The Landing.  Call 911 so we can get to you."