Pennsylvania police on Monday arrested a mother accused of killing her two young children in September.

Lisa Snyder, 36, was arrested by Pennsylvania State Police at her home in Albany Township and was taken into custody on charges of first and third-degree murder, as well as endangering the welfare of a child.

Her arrest comes after a nearly two-month investigation into the deaths of her children: 8-year-old Conner and 4-year-old Brinley. Their bodies were found hanging and unresponsive in the basement of their home on Sept. 23.

EMS flew their bodies to the Lehigh Valley Hospital in Allentown, where they were pronounced dead on Sept. 26.

The autopsy from the Lehigh County Coroner’s Office revealed the children died from hanging and categorized the deaths as homicides.

“It would be safe to say that we had immediate questions,” Berks County District Attorney John Adams told reporters. “Eight-year-olds, generally, that I am aware of, do not commit suicide, so of course we had questions.”

Snyder reportedly told police Conner had been suicidal due to bullying from school but this was refuted by classmates and teachers who said he wasn’t bullied at all.

Investigators began looking harder at Snyder, who had temporarily lost custody of her children five years earlier. Officers reportedly found online searches for committing carbon monoxide poisoning and hangings. Photos and messages on Facebook also revealed Snyder had been engaging in sex with a dog.

It had also been discovered Snyder had expressed frustrations about her life to an acquaintance.

“She had expressed to a friend that she had had enough,” Adams said. “I don't think that I can stand up here, nor can anyone, and explain the horrific loss of two innocent children's lives. I think it goes without explanation.”

A 17-year-old reportedly lived in the house but was not involved in the children’s deaths. The biological father also does not reside with the family.

Officers are continuing their investigation. It remains unclear if there was any motive.

Snyder was taken to Berks County Jail where she is being held without bond.

Police Line Pictured is a police cordon that surrounds the scene of a house fire in Sycamore Lane, Stafford, on Feb. 6, 2019 in England. Photo: Christopher Furlong/Getty Images