Summary A gunman shot at least three people at a US office complex in Arizona.
A gunman shot three people at a U.S. office complex after a dispute and remained at large, police in Arizona s largest city said Wednesday.
The country s latest mass shooting occurred as Congress took up the issue of gun control for the first time since the Connecticut school shooting in December left 20 young children dead and changed the national conversation on guns.
Police said one victim in the Arizona shooting was in extremely critical condition, and the other two had less severe injuries. All of the injuries could be life-threatening, Fire Capt. Scott McDonald said.
Sgt. Tommy Thompson said a dispute with someone at the building escalated to the point where the man pulled out a gun and started shooting. Thompson did not know what kind of gun was used.
Officer James Holmes said police believed there was only one shooter.
"We have no motive. It is right now a really fluid scene," Holmes said.
Holmes said police were given conflicting information about the suspect leaving the scene. The building was evacuated, and police were looking for any additional victims.
Vannessa Brogan, who works in the three-story complex, said she heard a loud bang that she thought at first was from somebody working in or near the building. She said others at the business thought they heard multiple loud noises. She said people locked themselves in offices until authorities evacuated the building.
Becky Neher, who also works in the building, said she heard two gunshots.
"Someone yelled, We have a shooter, " she said. She saw two victims lying on the ground outside the back side of the building. She said medical people who have offices in the complex came out to help.
