Police used water cannons and tear gas to disperse rioting concert goers in Bogota on Wednesday after hundreds of fans tried to break into a Metallica concert. Local media reported that more than 30-thousand ticketed fans entered the concert. But hundreds more without tickets tried to get in to see the heavy metal band. Police said up to 600 fans tried to break in from different parts of the park. Several police officers were injured by rocks and sticks thrown by irate fans. Police detained more than 100 people. Most of them were released. It was Metallica's first concert in Colombia in more than a decade.