NEW : Bahrain 's crown prince says security is not negotiable and calls for dialogue . Riot police appear to shoot a man point blank with tear gas , a video shows . Text messages exchanged between them and others in the area warned of regime supporters approaching from Muharak , another island , but it 's not clear whether the warnings were accurate . About 5,000 university students demonstrate against the government . Comment:
NEW : Bahrain 's crown prince says security is not negotiable and calls for dialogue . Riot police appear to shoot a man point blank with tear gas , a video shows . About 5,000 university students demonstrate against the government . Comment: