Officers are responding to a mass shooting at a video game tournament in Jacksonville, Florida, according to local media. Initial reports say as many as four people have been killed and 10 others injured. READ MORE: on.rt.com/9d44 Check out rt.com RT LIVE rt.com/on-air Subscribe to RT! www.youtube.com/subscription_center?add_user=RussiaToday Like us on Facebook www.facebook.com/RTnews Follow us on Telegram t.me/rtintl Follow us on VK vk.com/rt_international Follow us on Twitter twitter.com/RT_com Follow us on Instagram instagram.com/rt Follow us on Google+ plus.google.com/+RT RT (Russia Today) is a global news network broadcasting from Moscow and Washington studios. RT is the first news channel to break the 1 billion YouTube views benchmark.