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Noel Sean Myers, 50, was ordered held on $1 million bail.

Police went to Myers' home in the 600 block of South Cleveland Street at about 3 p.m. last Thursday to arrest him on suspicion of attacking a neighbor with a pipe or stick earlier in the day and assaulting his father two days prior, according to Oceanside police Lt. Leonard Mata.

When officers contacted him, Myers retreated into his residence and refused repeated orders to surrender, Mata said.

At one point during the ensuing standoff, the suspect fired a pellet gun out of the house, striking an officer in the face, according to Mata. No serious injuries resulted, he said.

In the late afternoon, a SWAT team surrounded the home and prepared to enter forcibly, if necessary, according to Mata. At about 6:15 p.m., officers fired tear gas into the home, forcing Myers out. Police were able to take him into custody without further incident.

Deputy District Attorney Ryan Saunders told 10News they "really have no idea" what prompted the suspect's actions.

"We know the facts," said Saunders. "We don't know why it happened."

In addition to assault on a peace officer and making threats, Myers is charged with elder abuse likely to cause great bodily injury, exhibiting a deadly weapon while resisting arrest and possession of an incendiary device.

Saunders said Myers battered his 81-year-old father.

"He grabbed him, dragged him around, and threw him to the ground, breaking his leg," said Saunders.

He added that Myers then "threatened to kill his father with a machete."

Myers faces life in prison if convicted.

Vista Superior Court Judge Tamila Ipema scheduled a readiness conference for May 23 and a preliminary hearing for May 29.