PennShooting_Dec15
A police vehicle is seen near a home in a suburb of Philadelphia where a suspect in six killings was believed to be barricaded in Pennsburg, Pennsylvania, December 15, 2014. Police were concentrating the search for Bradley William Stone in and around Pennsburg, Pennsylvania, the district attorney said in a Facebook post. Reuters/Brad Larrison

Update as of 3:23 a.m. EST: Schools around Montgomery County, Pennsylvania, are closed as law enforcement officials continued to look for a former army veteran suspected of killing six people, including his former wife and in-laws, CNN reported Tuesday.

"We do not know where he is," District Attorney Risa Vetri Ferman said, according to CNN. "We do not have vehicle information. We actually recovered his vehicle and his personal cellphone so we do not have information how he might be traveling."

According to an announcement on the website of the Upper Perkiomen School District: "Due to the fact that law enforcement still seeks the whereabouts of an armed and dangerous local resident, Upper Perkiomen schools will be closed on Tuesday, December 16th. Decisions regarding re-opening of school will be made on a daily basis, based upon consultation with law enforcement and investigative personnel."

The manhunt for Bradley William Stone has shifted to Bucks County, Pennsylvania, where authorities said a man fitting Stone’s description attempted a carjack at knifepoint on Monday night. The man fled into a wooded area in Doylestown, Pennsylvania, after the owner of the car fired shots at him.

Stone, a 35-year-old former Marine, is suspected of shooting and killing six people, including his ex-wife, Nicole Stone, and her 14-year-old niece, earlier Monday in Montgomery County, Pennsylvania, the Express-Times, a newspaper based in Easton, Pennsylvania, said. Stone was reportedly in a custody dispute with his ex-wife, according to Montgomery County District Attorney Risa Vetri Ferman. Stone’s two children were found safe in the home where there mother was shot dead.

Also killed in the Montgomery County shootings were Nicole Stone’s sister, Patricia Flick; Flick’s husband, Aaron Flick; Nicole Stone’s mother, Joanne Hill; and her grandmother, Patricia Hill, according to Philadelphia radio station WHYY.

The mass killings sparked a manhunt for Stone in Montgomery County. SWAT teams fired tear gas into the basement of Stone’s home, where he was believed to be hiding earlier in the day, according to Mike Neilon of Philadelphia ABC affiliate WPVI.

A man who fit Stone’s description and who was wearing military fatigues tried to carjack a man in Doylestown around 7:45 p.m. EST Monday, according to the Express-Times. The man called 911, which led authorities to center the manhunt in Bucks County, which is adjacent to Montgomery County. A helicopter and three K-9 teams were part of the search, the paper reported.

The Montgomery County shootings and resulting manhunt in Doylestown caused authorities to put Doylestown on lockdown, the Allentown Morning Call reported. Residents were advised to stay indoors and lock their doors and windows. The same instructions were given for residents of Pennsburg, where Stone lives.

The Central Bucks Family YMCA, based in Doylestown, was also under lockdown Monday night:

The original description of Stone said he was 5-foot-10, had red or auburn hair and was wearing a beard, but authorities later sent out a picture of a clean-shaven Stone that they said better fit his description on Monday:

Authorities also said Stone may use a cane or a walker to get around and that he may be wearing military fatigues that are either sand or green color.

The Upper Perkiomen School District, which straddles Bucks and Montgomery counties, canceled classes for Tuesday as the manhunt for Stone continued, Fox 29 Philadelphia reported.