(NewsNation) — Authorities in South Carolina say they are investigating what has become the third mass shooting in the U.S. over the Easter holiday weekend.

A shooting at Cara’s Lounge in Hampton County early Sunday left at least nine people injured, according to authorities.

The State Law Enforcement Division said in an email that there were no reported fatalities. No information on the severity of the injuries has been released.

In Pittsburgh, two minors were killed and at least eight others were injured in a shooting incident across several locations in East Allegheny, a neighborhood on the city’s North Side, officials said.

Police say several teens were observed fleeing the area on foot and by vehicle from a short-term rental property just after 1 a.m. Sunday. About 200 people were inside at the time, many of them underage, police said.

The names of the two youths who died weren’t immediately released. No arrests were immediately reported and police didn’t release information about any suspects.

The two mass shootings Sunday come just a day after gunfire erupted at a busy mall in South Carolina’s capital.

Nine people were shot and five people were injured while trying to flee the scene, Columbia Police Chief W.H. “Skip” Holbrook said. The victims ranged in age from 15 to 73 and police have arrested a suspect.

The string of shootings comes as the Biden administration faces pressure to take more steps to combat a national crisis of gun violence.

In the past week, the White House appointed a new head of the Bureau of Alcohol, Tobacco, Firearms and Explosives.

The president also signed an executive order cracking down on so-called ghost guns — firearms without serial numbers or background checks that come ready to be assembled in do-it-yourself kits.

The new legislation expands the definition of a firearm so that ghost guns will be subject to the same federal regulations as guns you buy from a dealer.

“These guns are weapons of choice for criminals we’re gonna do everything we can to deprive them of that choice,” Biden said.

The administration is now eyeing even more regulations that would:

• Ban assault weapons
• End the online sale of firearms
• And require background checks for all gun sales

Biden also said his administration is working to reduce gun violence through the following measures: “Going after rogue gun dealers, disrupting illegal gun trafficking, funding community policing and community violence intervention, funding job training, drug treatment, mental health and more.”

The White House is facing strong opposition from Second Amendment advocates — with a growing number of Republican-led states enacting laws ditching license to carry requirements and making it easier to own and possess a firearm.

The three shootings in South Carolina and Pittsburgh left a total of at least 31 people injured and are the latest in a rash of shootings across the country.

Additionally, one teen is dead and another is injured after a shooting at a party on Indianapolis’ South Side on Sunday morning. The suspect is in custody, according to NewsNation affiliate WXIN.

A total of 10 people were shot and dozens were injured in the Brooklyn subway shooting, an attack that evoked many transit riders’ deepest fears and left city officials discussing increased security measures.

A 15-year-old boy was shot in the head Wednesday outside Brooklyn’s Atlantic Terminal Mall. His injuries were not believed to be life-threatening. Officials said he was with a group of boys when they got into a dispute with a second group.

On Tuesday, a Southern California shoe store owner mistakenly shot a 9-year-old girl while firing at two shoplifters at the Mall of Victor Valley, police said.

And earlier this month, police said six people were killed and 12 others wounded in Sacramento, California, during a gunfight between rival gangs as bars closed in a busy area near the Downtown Commons shopping mall and the state Capitol.

The Associated Press contributed to this report.