Phoenix police hunt gunman who injured 5, 3 critically, inside office complex DEVELOPING: Phoenix police are searching for a man they say shot five people in an office complex Wednesday morning after he had some type of altercation with some of the victims, MyFoxPhoenix.com reported. Three of the five victims have life-threatening injuries and have been rushed to a nearby hospital. Though police have little information about the gunman's motive, they do not consider the shooting a random act, the report said. Police say the shooting occurred inside a mortgage company at 10:30 a.m. local time. Police said the gunman got into a dispute with someone at the building and the dispute escalated to the point where the man pulled out a gun and opened fire. Police did not know what kind of gun was used. The suspect is described as a white male in his 60s. Police are not sure if the shooter is still inside the building. The building has been evacuated and the area around the premises has been sealed. Rescue crews could be seen evacuating workers from the complex. Police units were also seen forming around the building for a future sweep. 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. We have a shooter A person yelled amid gunshots Vannessa Brogan, who works in sales support in an insurance business 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 central Phoenix building that houses insurance, medical and law offices. Becky Neher, who works for a title company in the building, said the two gunshots she heard sounded like two pieces of metal banging against each other. "We were doing our regular morning routine, and I hear what I guess were two gunshots," she said. Watching from her second-story office, she saw people leaving the building. "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 there are medical people who have offices in the complex, so they came out to help.