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ALBANY TWP., Pa. - Pennsylvania State Police have obtained a fifth search warrant in their ongoing effort to uncover clues surrounding the deaths of two children found unresponsive inside their Berks County home last month.

The latest warrant seeks a second cell phone belonging to the children's mother, Lisa Snyder, who, police said, used it to call 911 on September 23, the day she reported finding her two children hanging from a cable in the basement of the family's home on Route 143 in Albany Township.

The children, 8-year-old Conner Snyder and his 4-year-old sister, Brinley, died in the hospital a few days later.

Police said they had already seized multiple electronics from the home, including a black UMX cell phone from Snyder, as part of previous search warrants. They said they weren't aware she had a second cell phone -- a Samsung Galaxy Note 9 -- until they interviewed her 17-year-old son.

"We're going to go through each piece of evidence that we have obtained and examine it thoroughly until we can get to the bottom of this," Berks County District Attorney John Adams said Friday. "We are hoping to find some answers to what happened to those two children."

Authorities said they are also awaiting results of more tests being done as part of the children's autopsies, promising to leave no stone unturned in a case that hasn't been easy for those closely involved with the investigation.

"It is really, you know, it's a difficult, emotional case for many people," Adams said, "and it's difficult for those of us who are prosecutors, the investigators. We want to get some answers, and we are going to work hard and diligently to get those answers."

The Lehigh County coroner is working closely with state police and the Berks County district attorney because the children died at Lehigh Valley Hospital near Allentown. He told 69 News earlier this week that the full autopsy lab results could take weeks.