Dallas police Dept on high alert after a masked man was reportedly seen in the building

There were news reports that Dallas Police Headquarters was on lock down due to a masked person seen entering the building. However, Dallas Police Dept through their twitter account has debuinked that claim. They said they searched the parking garage looking for a suspicious person based on a tip they received but that the building was not on lockdown. Guess they are on high alert after 5 members of their police force were killed and 7 others were injured by a lone sniper that is now dead. Read their tweets after the cut...