WHAT WE KNOW: Massacre in Las Vegas kills at least 58, injures at least 515

Authorities are investigating a mass shooting that killed at least 58 people and injured at least 515 others at a country music concert Sunday night.

Las Vegas police said Monday that it will take time to identify all of the injured and dead in what was the deadliest mass shooting in U.S. history.

Country music star Jason Aldean was performing Sunday night at the end of the three-day Route 91 Harvest Festival when the gunman opened fire from inside the Mandalay Bay Hotel and Casino.

Authorities say 64-year-old Stephen Craig Paddock killed himself after the shooting. Police have not yet determined a motive.

Heavily armed police are searching Paddock’s Nevada retirement-community home. Mesquite Police Chief Troy Tanner says police surrounded and entered the single-family home where Paddock lived with 62-year-old Marilou Danley early Monday morning.

He says Danley was not at the house and police saw “no movement” inside before serving a search warrant at the one-story, three-bedroom home in the Sun City Mesquite retirement community, about 80 miles north of Las Vegas.

President Donald Trump is calling the mass shooting attack in Las Vegas “an act of pure evil.”

Trump says the nation is joined together today in sadness, shock and grief.

Trump tweeted his “warmest condolences and sympathies” earlier Monday morning.

President Trump says he will visit Las Vegas on Wednesday to meet with first responders, families.

Pope Francis is calling the Las Vegas shooting a “senseless tragedy” and is assuring victims of his prayers.

The Vatican secretary of state sent a telegram of condolences Monday to the bishop of Las Vegas, saying the pope was “deeply saddened” to learn of the shooting.

The telegram said Francis praised the efforts of police and emergency crews.

This is a developing story. Stay with KRDO.com and KRDO NewsChannel 13 for updates.