Police officers gather outside the White Memorial Chapel in Pittsburgh during a Tuesday afternoon visitation for fallen Pittsburgh officer Eric Kelly, who was shot and killed along with two other city police officers while responding to a 911 call Saturday in Pittsburgh.

PITTSBURGH Three police officers killed while answering a call Saturday about a woman fighting with her son will lie in state at the City-County Building today, and all three will be honored at a memorial service Thursday.

Meanwhile, the man suspected of fatally shooting the officers, Richard Poplawski, 22, is under close observation at the Allegheny County Jail on criminal homicide, attempted homicide and other charges, said Warden Ramon Rustin.

Robert Full, Allegheny County Chief of Emergency Services, said the 911 operator who failed to warn the officers that Poplawski had guns, is too distraught to be interviewed, so officials don't fully understand why she didn't press for more information about the guns. She apparently inferred the weapons weren't a factor because her conversation with the mother was casual and because Poplawski didn't report being threatened, he said.

When officers arrived at the house, Margaret Poplawski opened the door for them. She later told police that she didn't know that her 22-year-old son was standing behind her with a gun.

Police say Richard Poplawski shot officer Paul Sciullo II, 37, in the home and officer Stephen Mayhle, 29, on the front stoop within seconds. He then shot officer Eric Kelly, 41, in the street as he arrived to back them up, prompting a four-hour siege and gun battle with police, authorities said.

Poplawski faces an April 17 preliminary hearing.

According to the two-minute recording of Saturday morning's call played for a reporter, Margaret Poplawski sounded impatient as she asked for police to come take her son out of the house. A Pittsburgh newspaper first reported details of the call.

"Are you moving or what?" she asks, apparently to her son.

"Does he have any weapons or anything?" the 911 operator asked.

"Yes," the mother said. After a long pause, she added, "They're all legal."

"OK, but he's not threatening you with anything?" the operator said.

Without answering, Margaret Poplawski mother said, "Look, I'm just waking up from a sleep. I want him gone."

"OK, we'll send 'em over, OK?" the operator said.

"Sounds good," the mother said, as the call ends.

Full said the call-taker is a part-time employee who received the standard 320 hours of training. She is paid $13.50 an hour.