Local law enforcement officials said late last week it is their understanding McCall could face another 41 felony counts of possession of a firearm.

Clarion County District Attorney Mark T. Aaron confirmed an ongoing investigation into possible weapons charges.

“We are researching the matter,” said Aaron.

McCall also is expected to face state charges related to the original case against him. Those charges include causing or risking a catastrophe and possession of facsimile weapons of mass destruction, both third-degree felonies; making terroristic threats and stalking, both first-degree misdemeanors; retaliation for past official action, a second-degree misdemeanor; and harassment, a third-degree misdemeanor, at various times between Feb. 11 and Feb. 21, 2008, in Ashland Township.

The new round of investigation also might lead to charges related to an Oct. 29, 2007 , incident, during which what appeared to be a homemade facsimile explosive device was found by PennDOT workers along the eastbound Interstate 80 exit 62 off ramp in Monroe Township .

The device was a liquid-filled plastic bottle with batteries attached using duct tape and with wires running from the batteries to the contents of the bottle.

During the course of the investigation of the previous charges, investigators allegedly learned McCall was once convicted of impersonating a police officer in 1989.

With that conviction, McCall is allegedly banned from owning or possessing a firearm.

According to court documents, a state police trooper assigned to the Clarion barracks began receiving telephone calls early last year at his Western Clarion County home.

On Feb. 11, 2008 , a message was left on his home answering machine. The trooper lives at the home with his wife and two young children. The Feb. 11, 2008 , message was allegedly a pre-recorded movie clip, which included a statement about “relentless excruciating pain.”

On Feb. 17, 2008 , another message was left on the family’s answering machine. Again the message allegedly was a recording of a movie clip, which included the sound of gunfire and a reference to “walking in public.”

On Feb. 19, 2008 , another message was left on the family’s answering machine. Again the message allegedly was a recording of a movie clip, which included a reference to killing a police officer.

All of the calls were received with a caller identification “blocked.”

The trooper also received two “hang-up” calls at the police barracks.

A court order was obtained to trace the calls and an investigation allegedly determined the calls came from a telephone in McCall’s name.

The trooper recognized McCall’s name as someone he had charged in the past with other offenses. McCall was arrested at 7:20 p.m. Feb. 20, 2008 , at his home.

A search warrant was obtained for McCall’s home. The warrant was executed Feb. 20 and 21, 2008, with police searching for electronic recording and processing equipment.

During the search, state police Cpl. Alan Carmichael reported police found literature outlined the directions for “making bobby traps, explosive devices and poisoning.”

In an upstairs bedroom, police report they found components for explosive devices, including metal-pipe bomb-like devices, black powder and detonating fuse.

According to court documents, “some of the components appeared to be assembled.”

The residence was evacuated and the Pennsylvania State Police Hazardous Devices and Explosives Team was called in. A second search warrant was obtained to further the search.

The secondary search turned up 18 containers of black powder, 90 feet of detonating fuse, 26 metal pipe bomb-like devices, one empty hand grenade and approximately six copper pipe bomb-like devices, one of which had wires attached.

During the federal trial in Pittsburgh , prosecutors noted the steel pipe caps McCall allegedly intended to use on the pipe bombs were stamped with a manufacturer’s name, “Ward.” Prosecutors said McCall carefully ground or filed the “d” off the word so that it read “War.”

At least 40 firearms also allegedly were found in the home.

Law enforcement officials believe McCall was involved with the facsimile explosive device found in October 2007 after they allegedly found handwritten notes in some of the manuals found in McCall’s home. The notes apparently relate to the device found along the Interstate 80 exit. A handwriting expert determined the notes in the books were written by McCall.

The alleged bomb was found just over an embankment from the state police barracks.

McCall also allegedly dumped boards containing nails in the driveway of the state police barracks.