Negotiators using a bullhorn Thursday night repeatedly told Phillips to come to the door with his hands empty, but he answered by shooting at them, police say. The force it took for the gunfire to break the windshield of the armored vehicle convinced police that the man was using a rifle.

Police said that roughly 174 calls were made to a working phone line within the home. Police say negotiators were met with "fierce resistance."

By midday Friday a police vehicle with a battering ram drove between two homes on Verdun Estates Drive, and minutes later repeated bangs were heard up the block. Police deployed gas to try to get Phillips out.

Shots were first exchanged Thursday between Phillips and law enforcement officers. Granda said the shots were exchanged before tactical officers arrived. Granda said he didn't know how many shots were fired in the first exchange. Police were trying to coax Phillips to surrender.

On Friday morning, the standoff entered its second day. The county's tactical operations team was still there, as well as police from St. Louis city and St. Charles County.

Police warned the public about the heavy police presence there and said access to some streets was limited. Officers were shown escorting some nearby residents to their homes.