Police in Las Angeles are urging the public to be vigilant as they prepare for the possibility of another mass shooting, this time in Las Brisas, a city about 20 miles (32km) north of the Las Vegas Strip.
Police have launched an investigation into reports of an active shooter at a condominium complex in the city’s Las BrisAS district.
The police department said on Twitter that there were reports of shots fired at a building near the city hall in the townhouse district.
Police said the shooting happened shortly before 1pm local time (1300 GMT) on Sunday at a condo complex near the town hall, where about 30 residents are staying.
A video posted online showed people fleeing as the building erupted in flames.
“We are urging residents to stay inside your homes as this is a very dangerous situation,” Las Vegas Police Department tweeted.
“Stay indoors and keep your doors locked, lock your windows and lock your doors.
We are not giving out details of the incident at this time.”
The city’s mayor, Kevin Faulconer, said: “I want to reiterate our heartfelt condolences to the Las Brisasa community for this horrific loss.
This is not the type of community we want to be in.”
In the video, a woman can be heard saying: “It’s going to be hell.
It’s going, it’s going.”
She is then heard saying “this is the end”.
The man who posted the video later said he had been watching the city council meeting in the council chamber and saw a group of people fleeing.
“People started running and then the building started going up in flames,” the man said.
The incident happened just hours after a gunman killed 49 people and injured hundreds more in a deadly shooting spree in a historic church in Charleston, South Carolina, which has also sparked national debate about race and gun control.
Las Brisras is about 60 miles (100km) west of the city, which is a predominantly white, Mormon community.
On Sunday night, a white gunman opened fire at the Emanuel African Methodist Episcopal Church, killing nine people, including the pastor.
It is not clear whether the shooter was connected to the Charleston church shooting, which was carried out by a white man.
On Saturday, police in Las Rosas, about 60 kilometres (37 miles) west, said they had received a report of an explosion at a house at the corner of Las Brisasse and Las Rosadas.
Residents said there had been reports of people running and a loud bang at around 4:30pm local, when they were told to shelter in place.
The Los Angeles Times reported that the explosion had caused a fire that was spreading.
In another incident, a police officer was shot and injured in Las Riojas.
Local media said a woman and a child were injured in a shooting at a nearby condominium building, which had been partially engulfed by flames.
The fire was extinguished at 5:10pm local.
Police had warned that the city was at “high risk” of a shooting and a major lockdown was in place as authorities investigated.
In a separate incident, two men were arrested on suspicion of trying to buy a firearm and ammunition from an undercover agent in Las Rozas.
Authorities said the men had bought weapons in an online shop and had purchased $7,500 in ammunition, which they were attempting to use as a suicide weapon.
Las Rozsa is a small city of around 1,200 people on the Gulf Coast about 30 miles (48km) from Los Angeles.
In 2015, an anti-gun activist shot dead six people, two of them police officers, in a botched attack at the home of a former gang member.
A year earlier, a gunman opened a fire at a nightclub in Las Cruces, New Mexico, killing four people.
A manhunt was launched for the man responsible for that attack.