More details are emerging about an explosion that injured a Petersburg person over the weekend and has brought federal explosives agents to town to investigate.

Petersburg police issued a press release outlining the incident and some of the resulting investigation. Since no criminal charges have been filed, police are declining to identify the person injured in the explosion Sunday other than to say it was a 59-year-old Petersburg resident.

In their press release, police say the department received a 911 call reporting a person laying outside of the hospital emergency room at one o’clock Sunday afternoon. The caller requested assistance getting the person into the hospital and reported the injury could have been caused by dynamite.

Emergency medical volunteers and firefighters along with local police officers helped hospital staff get the injured person into the emergency room. Police say the person confirmed the injuries were the result of an explosion. Police cordoned off the area shutting down the street and access to the emergency room. Officers found what appeared to be approximately 20 pounds of a gelatinized substance in a vehicle the injured person drove to the hospital. Officers notified hospital staff and moved a large dump truck directly behind the vehicle. Police say residents in the area were notified and some evacuated. Local police say they consulted with a local construction company, state Department of Transportation staff and personnel from Fort Richardson before public works employees moved the explosives away from the hospital.

Agents with the Federal Bureau of Investigation and the bureau of Alcohol Tobacco and Firearms are in town and have brought an explosive detecting dog. An investigator with the state fire marshal’s office is also here. A Coast Guard C-130 aircraft flew in five of the responders on Monday, along with a response vehicle and equipment. Police say three sites, including the unnamed location of the explosion, were secured by local police along with U.S. Forest Service officers.

Local officers along with federal agents served search warrants Monday at a home on North Nordic Drive along with the vehicle left near Petersburg Medical Center. Officers and agents processed the scene of the explosion and the vehicle left near the hospital. Residue from the explosion site and the vehicle were tentatively identified as a commercially available explosive.

A police car was stationed outside a North Nordic Drive home belonging to Mark and Pat Weaver Monday and police tape cordoned off the yard of that home from the street. Mark Weaver turned 59 on Saturday. Other property near Cornelius Road south of town belonging to Weaver was also cordoned off by police this week.

The police investigation continues and authorities say more information will be available later.