Two adults have been hospitalized following a shooting at East High School in Denver, according to Denver police.

Former NYPD chief of detectives Robert Boyce and ABC News’ Alex Stone break down the investigation into a school shooting in Denver on Wednesday.

Police are looking for the 17-year-old suspected shooter accused of opening fire inside his high school.

The student was under a "certain agreement to be patted down each day" at school, authorities said.

Two staffers were injured with both in serious condition.

The high school is on lockdown, with all students in their classrooms, according to Denver Public Schools.

Authorities in Sumter County, South Carolina, said they believe a second man found dead at the scene was the shooter.

Three security guards stopped an armed man from entering a Florida strip club early Sunday morning, police said.

Milwaukee police say a 15-year-old boy has died and five young women have been injured in a shooting in the latest violence to target the city’s young people

The City of Miami Beach voted against extending curfew restrictions, a day after the city imposed an overnight curfew for South Beach after multiple fatal shootings.

One student was fatally shot and another injured outside a Texas high school on Monday, according to the Arlington Police Department.

A Virginia teacher who was shot and wounded by her 6-year-old student says she has had four surgeries and is going through a challenging recovery

One student was shot and killed, and another was wounded outside Lamar High School in Arlington, police said.

Police says a student opened fire at a Dallas-area school Monday morning, killing one student and injuring another before being arrested on a capital murder charge

There have been rowdy, chaotic crowds that police have had trouble controlling.

Gunfire erupted in an area of Miami Beach crowded with people on spring break.

The ages of the victims and other details weren't immediately available.

New York City police allege a gunman running through Manhattan was stopped with the help of a Good Samaritan.

Two people are dead after a shooting at a hotel in Portland, Oregon, police said.

The incident occurred at a hotel near the Portland airport.

Biden also acknowledged the heroism of Brandon Tsay, who subdued the gunman to bring an end to the attack and who attended his State of the Union Address in February.

President Joe Biden signed the new bill with the aim to reduce gun violence, boost background checks and promote red flag laws.

President Joe Biden signed an executive order that aims to reduce gun violence during a visit to Monterey Park, California, where a mass shooting took place in January.

Four people are dead after a gunman opened fire at two homes in the Birmingham, Alabama, area, authorities said.

President Joe Biden signed an executive order aimed at reducing gun violence in Monterey Park, California, where 11 people died and 9 others were injured in a mass shooting in January.

President Joe Biden on Tuesday announced he was signing an executive order to require background checks on more gun sales. ABC News’ Ike Ejochi and ABC News contributors break down the order.

A suspect accused of fatally shooting a police officer has surrendered outside of a Hermann, Missouri home, according to law enforcement officials.

Court documents say a man and woman charged in the fatal shootings of four people at a Dallas apartment where an infant was found unharmed told police they’d broken into the home to take money

Four adults were found shot to death inside their Dallas apartment Sunday along with an infant who wasn't harmed, police said. Two suspects are in custody.

Harris County, Texas, Sheriff Ed Gonzalez said the child was "unintentionally" shot.

A 3-year-old in Houston gained access to a firearm and "unintentionally" shot and killed a 4-year-old, Harris County Sheriff Ed Gonzalez said.

A standoff following a shootout between deputies and a barricaded suspect in a Los Angeles County residence ended after two days with the shooter committing suicide.

New surveillance video shows the moments before the mass shooting at Michigan State University in February.

A marathon standoff following a shootout between deputies and a barricaded suspect in Los Angeles County has been ongoing since Friday afternoon, according to authorities.

Multiple people were shot, some fatally, at building used by Jehovah's Witnesses in Germany Thursday night, police said.

The incident involved one or more unknown perpetrators, according to an alert from the city of Hamburg.

The parolee at large died at the scene and the three officers from the K-9 unit were listed in stable condition, according to the LAPD.

Three LAPD officers were shot Wednesday night in Los Angeles, police said.

A prosecutor in Virginia has deemed the boy, accused of shooting his teacher, too young to stand trial. ABC News’ Andrea Fujii has the new details.

Former Seattle Supersonics star and NBA great Shawn Kemp has been arrested for his involvement in a drive-by shooting at a mall, police say.

A local prosecutor said Wednesday that he does not believe the law supports charging the 6-year-old boy accused of shooting a teacher at his Virginia elementary school.

A $20,000 reward is being offered in the investigation of a shooting outside a suburban Atlanta "Sweet 16" birthday party that left two children dead.

The shooting occurred outside Lucas Oil Stadium, home of the NFL’s Indianapolis Colts.

A suspect remains at large after a man was shot dead outside Lucas Oil Stadium in downtown Indianapolis on Monday night, police said.

Bolingbrook police said a suspect has been detained.

The party was packed with more than 100 teenagers 20 miles west of Atlanta, according to police.

Authorities say a Georgia shooting has killed two of the more than 100 teenagers who had gathered at a house party Saturday, with six others wounded

At least two people were killed and six others were injured when gunfire erupted late Saturday night at a suburban Atlanta house party.

A prosecutor says three Indianapolis men have been convicted of murder and other charges in the fatal shooting of three young men and a young woman found slain in a ransacked apartment

Three people were killed, and two others were injured in a series of shootings last week in Orlando, Florida.