Flags are flying at half-staff across Pennsylvania today after Gov. Josh Shapiro ordered them lowered statewide to honor Pennsylvania State Trooper Michael Pahira, who died in the line of duty in Schuylkill County.

Shapiro ordered flags fly half-staff at Pennsylvania facilities, public buildings and grounds — the United States flag and Pennsylvania flag — to honor Pennsylvania State Trooper Michael Pahira, who died in the line of duty in Schuylkill County.

Pahira died after being struck by a tractor-trailer while conducting a commercial vehicle inspection along Interstate 81 in Schuylkill County, authorities said. A Massachusetts truck driver has since been charged in the crash, and flags will remain at half-staff until the date of Pahira’s interment, which has not yet been announced.

Why are flags at half-staff today in Pennsylvania?

Gov. Josh Shapiro ordered flags across Pennsylvania to fly at half-staff in honor of Pennsylvania State Trooper Michael Pahira, who died in the line of duty July 1. The order applies to Commonwealth facilities, public buildings and grounds statewide and remains in effect until his interment.

What’s the difference between half-staff and half-mast?

The difference between a flag flying at half-staff and half-mast depends on where the flag is flown. In the United States, flags on land are lowered on staffs, while half-mast traditionally refers to flags flown from ships and at naval stations ashore.

Who was Trooper Michael Pahira?

Pahira was a Schuylkill County native and nearly 20-year veteran of the Pennsylvania State Police, authorities said. He enlisted in January 2007 and was assigned to Troop L in Frackville as a Motor Carrier Inspector. He was 44 years old and became the 106th member of the Pennsylvania State Police to die in the line of duty.

What happened to Trooper Michael Pahira?

State police said Pahira was conducting a commercial vehicle inspection along Interstate 81 southbound in Schuylkill County when a second tractor-trailer left the roadway and struck his marked patrol vehicle and the truck he was inspecting before hitting him. Both commercial vehicles caught fire after the crash. Pahira was taken to a hospital, where he was pronounced dead. Authorities said a Massachusetts truck driver has since been charged with homicide by vehicle in connection with the crash.

How long will flags be lowered?

Pennsylvania Gov. Josh Shapiro ordered US and Pennsylvania flags fly half-staff today and through the date of interment, or the burial or entombment of Pahira following his funeral.

Lori Comstock is a New Jersey-based reporter covering trending news with USA TODAY Network’s Mid-Atlantic Connect Team. She covers news in the Northeast, including New Jersey, Pennsylvania, Delaware, Washington DC, Maryland, and Virginia. Reach her at LComstock@usatodayco.com.