US President Joe Biden and first lady Jill Biden offered comfort Sunday to a city gripped by grief and anger. Video / AP

Questions about why police waited outside while school shooter massacred children.

The gunman who killed multiple children and teachers walked into the school "unobstructed", according to police. Video / AP

Residents of Uvalde, Texas, attended a prayer vigil Wednesday evening for the victims of a school shooting the day before. Video / AP

Misinformation and conspiracy theories began to spread online only hours after carnage.

Jacinto Cazares lost his 10-year-old daughter when gunman opened fire in the classroom.

Names of those killed have begun to emerge.

A gunman opened fire at a supermarket in Buffalo, New York, killing at least 10 people before being taken into custody. Video / Reuters

"I shouldn't have to treat a gunshot wound as a choir teacher."

This week marks the 20th anniversary of the Columbine High School attack.

A survivor of the Columbine High School massacre describes his life 20 years on.

The group no one wants to be a part of - but once you're in, you're in.

Heartbreaking rhyme prepping kids for school shootings has sparked heated debate in US.

The gunman excused himself from class and returned with two handguns.

As the UK erupted with royal wedding joy, the US mourned another senseless massacre.

Boy who sent horrific texts to girl has been allowed back at the school while she suffers.

Ten people were killed during the latest US mass shooting in Texas.

It was the worst day of Linda's life and she had to jump on a plane urgently.

First 911 call comes in 68 seconds after Cruz opens fire. Here's how the event unfolded.

Jesse Osborne had researched school shooters for months and was determined to outdo them.

Zachary Cruz reportedly told police he feels he could have done more to stop the shooting.

Concocted story is the latest cautionary tale about the internet.

Coral Springs Police officers were stunned and upset to find sheriff's deputies hiding.

Donald Trump called the officer a coward stating 'he didn't have the courage'.

LA school evacuated after Ex-Miami Dolphins player Jonathan Martin threatened a shooting.

Educators don't need to be trained to take out potential school shooters.

Youth is actually not wasted on the young - it gives them fresh insights to old problems.

Trump says he's considering backing trained school employees to carry concealed weapons.

He has been hailed a hero for holding the door open so his classmates could flee gunfire.

Trump says he is open to improving checking system.