A judge has ordered the man accused of striking and killing a Waltham police officer and National Grid utility worker held without bail for 120 days.

Waltham judge Ellen Caulo sided with prosecutors that suspect Peter Simon, 54, of Woodsville, N.H., is a “clear and convincing” danger to the community, during a dangerousness hearing Thursday morning.

Similarly to his arraignment the day after the Dec. 6 incident, Simon was met with a packed courtroom of grieving family and a show of solidarity from police officers and utility workers.

Caulo continued the case to Feb. 29, when Simon is set to appear for a probable cause hearing.

Simon’s attorney Lynda Duntas had argued the suspect should be placed in home confinement and monitored by GPS before the trial, backed by how the defendant has completed probation in past cases.

“He is a dangerous person. He shouldn’t be out on the street right now awaiting trial. The Commonwealth proved their point,” Waltham Police Chief Kevin O’Connell told reporters outside the courthouse. “I think it’s going where it’s supposed to go. We are satisfied with the outcome today.”

Simon faces a slew of charges including two counts of manslaughter, assault with a dangerous weapon, armed robbery, failure to stop for police, negligent operation of a motor vehicle, larceny of a motor vehicle, leaving the scene of an accident after causing personal injury and death, two counts of leaving the scene of an accident after causing property damage, a marked lanes violation, and unlicensed operation of a motor vehicle.

Simon is accused of running down officer Paul Tracey, 58, a 28-year veteran of the Waltham police department and Roderick Jackson, 36, a National Grid worker from Cambridge.

The incident unfolded around 4:20 the afternoon of Dec. 6, with a police report detailing the drama.

Simon, the report states, pulled his older model gray Ford F-150 pickup truck to the side of Totten Pond Road while traveling eastbound, suddenly turning back into the roadway in an attempt to execute a U-turn.

Simon proceeded to collide into a white Jeep that attempted to go around him, with the suspect then taking off at “a high rate of speed in an easterly direction on Totten Pond Road,” the report states.

The National Grid work site was surrounded by flashing lights coming from the utility vehicles and orange cones and construction signs on the side of the road, a responding officer stated in the police report. Moments after Simon veered toward the site, the officer stated he noticed a “large amount of debris go airborne.”

After crashing into the officer and utility workers at the detail site, Simon sped away, colliding into multiple other vehicles before fleeing on foot, officials said.

A responding officer spotted Simon in a nearby neighborhood allegedly saying, “Police are going to kill me,” according to the report. The suspect then pulled a knife on the officer before getting into the officer’s cruiser and taking off at a “high rate of speed,” the report details.

While fleeing, Simon is said to have struck two Waltham cruisers. Then a pursuit proceeded before Simon crashed in the area of 225 Winter St., where he was taken into custody.

During Thursday’s dangerousness hearing, a prosecutor highlighted Simon’s lengthy criminal history.

In August 2009, Simon, a former resident of Brattleboro, Vt., fled from police before crashing head on into a public transportation bus in Keene, N.H.

Simon was charged with several felonies and sentenced in 2011 to five years in a psychiatric unit in Hampshire State Prison in Concord.

Simon and the driver of the bus suffered minor injuries in the crash, while a passenger in the bus suffered injuries and was airlifted to a hospital, the Brattleboro Reporter reported at the time.

Simon’s sentence was later terminated in November 2015.

Simon suffered from a “dissociative disorder” and a history of panic attacks, Cheshire County Attorney Peter Heed said at the time.