(CNN) — A Pennsylvania man went on a killing spree in the Philadelphia suburbs Monday morning, taking the lives of his wife and five in-laws, said the district attorney for Montgomery County, Pennsylvania, at a Monday night press conference.
An intense manhunt is under way for suspect Bradley William Stone, 35, of Pennsburg, said District Attorney Risa Vetri Ferman. Stone was described as armed and dangerous.
Ferman said Stone is suspected of killing his ex-wife and her mother, grandmother and sister, as well as the sister’s husband and 14-year-old daughter.
Ferman said the sister’s 17-year-old son was wounded and was being treated at a hospital.
Stone briefly took his two young children, but dropped them off at a neighbor’s in Pennsburg, Ferman said. The children are safe, she said.
“We recovered his vehicle and personal cell phone… we have no information about how he might be traveling,” Ferman said. “We don’t know where he is.”
She didn’t provide a motive.
On Monday night, the police search focused on Pennsburg, according to CNN affiliate WPVI.
Ferman said the search began at 4:25 a.m. with a 911 hangup call made directing police to the town of Lansdale.
Upon arrival, Ferman said, law enforcement officers found two women who had been slain. They were Stones’ former mother-in-law and former grandmother-in-law.
At 4:55 a.m. a neighbor of Stone’s ex-wife called 911, Ferman said. Police went to an apartment in Lower Salford and found Nicole Stone, 33, dead.
At 5:30 a.m. Stone delivered his two daughters to a neighbor in Pennsburg, Ferman said. That was the last time anybody saw him.
About 8 a.m., police went to the residence of Nicole Stone’s sister, Patricia Flick, in Souderton.
“Tragically, Ms. Flick, her husband and her 14-year-old daughter were killed at the residence and a 17-year-old son was found there and is now receiving treatment at a hospital in Philadelphia,” Ferman said.
Though last discovered, it appears the killings in Souderton took place first, the district attorney said.
The district attorney’s office had said Stone has used a cane or walker in the past and may be wearing military fatigues, in either sand or green color.
But Ferman said Monday night that nobody noticed Stone using a cane or walker on Monday.
WPVI said police originally thought Stone was holed up inside the house in Lansdale, so officers surrounded the residence.
Heavily armed SWAT teams tossed flash-bang devices into the house and stormed the residence, but police said Stone was not inside.
Stone served as a reservist in the U.S. Marines until 2011, mainly as a meteorologist, according to the Marines. He served a few months in Iraq in 2008.