MONTGOMERY COUNTY, Pa. (CBS) — The intense manhunt for a former Marine accused of fatally shooting his ex-wife and five of her relatives in Montgomery County stretched into its second day Tuesday.

Authorities are intensely searching for 35-year-old Bradley William Stone, of Pennsburg. The FBI is also involved in the search.

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As a result of the manhunt, schools in the Upper Perkiomen School District were closed Tuesday. Schools in the Pennridge School District opened as scheduled Tuesday, but they operated under a modified lock down, which meant students remained indoors and only known individuals were permitted to enter schools. Souderton schools opened as normal Tuesday, but with no outdoor classes or recess as the search for Stone continues.

The Montgomery County District Attorney's Office released a new photo of Bradley William Stone on Monday night.  (credit: Montgomery County DA)

The Montgomery County District Attorney’s Office released a new photo of Bradley William Stone on Monday night. (credit: Montgomery County DA)

Stone is suspected of killing his ex-wife, 33-year-old Nicole Stone, and five of her family members in three separate locations in Montgomery County Monday morning.

Investigators say the first shooting happened in Souderton at about 3:30 a.m. Monday. Montgomery County District Attorney Risa Vetri Ferman said Stone fatally shot his former sister-in-law, her husband and the couple’s 14-year-old daughter. Ferman said the couple’s 17-year-old son survived being shot and is listed in very serious but stable condition at a hospital in Philadelphia.

Ferman said Stone then went to a home in Lansdale and fatally shot his former mother-in-law and former grandmother-in-law.

According to Ferman, Stone then went to the Lower Salford home of his ex-wife, Nicole Stone, and fatally shot her. Ferman said Stone then took the couple’s two daughters, but he dropped them off at a neighbor’s home in Pennsburg shortly after.

“We will find Mr. Stone,” emphatically said during a news conference Tuesday.

Ferman said investigators searched Stone’s home and found evidence pertaining to the shootings.

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Police searched the home of Bradley Stone. (credit: Jim Melwert)

Police searched the home of Bradley Stone. (credit: Jim Melwert)

Ferman said Stone’s current wife and their infant child were safe.

Digital billboards featuring Stone’s photos will be appearing soon, Ferman said.

During the Tuesday news conference, Ferman said a report by a man about an attempted carjacking by a man matching Stone’s description in Doylestown Monday night did not appear to be valid.

Stone is described as 5’10”, 195 pounds, with a red/auburn beard and mustache with closely cropped hair. He is known to use a cane or walker to assist him. Stone may be wearing military fatigues, in either sand or green color.

“We actually recovered his vehicle and his personal cell phone, so we do not have information about how he might be traveling,” Ferman said.

According to a Marine spokesperson, Stone is a former Marine who served in Iraq in 2008 and was honorably discharged from the Reserves in 2011.

Stone should be considered armed and dangerous. Anyone with information about Stone’s whereabouts is asked to call 911 immediately.

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