The sister of the gunman in the deadly rampage in Dayton, Ohio, was among the nine killed during the early-morning shooting in a popular nightlife area that left dozens injured, officials revealed today.

Dayton Deputy Director and Assistant Chief of Police Lt. Col. Matt Carper identified the gunman as 24-year-old Connor Betts. His sister, 22-year-old Megan Betts, was among the nine killed, according to Carper, who added that all of those killed during the rampage were shot in the city’s Oregon District around Fifth Street.

Betts was killed by police less than a minute after he opened fire with a .223-caliber rifle in the streets of the Oregon District around 1 a.m. today in the second U.S. mass shooting in less than two days after at least 20 people were slain in El Paso, Texas.

“This is a heartbreaking tragedy,” Ohio Gov. Mike DeWine told reporters at a news conference this afternoon. “It is the type of tragedy that you hope never comes to your state.”

Carper said of the nine victims, four were females and five were males. The other victims were identified as 27-year-old Lois L. Oglesby, 38-year-old Saeed Saleh, 57-year-old Derrick R. Fudge, 30-year-old Logan M. Turner, 25-year-old Nicholas P. Cumer, 25-year-old Thomas J. McNichols, 36-year-old Beatrice N. Warren-Curtis and 39-year-old Monica E. Brickhouse.

Dayton Mayor Nan Whaley said the gunman was wearing body armor and had additional high-capacity magazines.  The Oregon District was filled with “thousands” of people out on a weekend night at the time, according to Whaley. Officers were also stationed in the neighborhood and were able to halt the rampage less than a minute after it began, the mayor added.

“If Dayton police had not gotten to the shooter in under a minute — and figure that 26 injured, 9 dead — hundreds of people in the Oregon District could be dead today,” Whaley told reporters.

DeWine praised the fast response by law enforcement, saying it saved “many, many lives” and the assailant was “very close” to killing “dozens and dozens more people.”

“In this tragedy, we have to thank our first responders,” the governor said.

Officials said there will be a vigil at 8 p.m. this evening in the Oregon District to remember the victims of the shooting.

Whaley said at least 27 people were treated for injuries, and at least 15 of those have been released. Several more remain in serious or critical condition.

President Trump has ordered flags at half-staff in remembrance of the victims of two mass shootings in less than a day, which killed at least 29 people. A proclamation released by the White House today said the nation shares “in the pain and suffering of all those who were injured in these two senseless attacks.”

Trump added in a tweet this afternoon, “Melania and I are praying for all those impacted by this unspeakable act of evil!”

In another tweet he wrote, “God bless the people of El Paso, Texas. God bless the people of Dayton, Ohio.”

The first attack at a shopping area in El Paso, Texas, killed at least 20 people. That was followed by another shooting in a nightlife district in Dayton, Ohio, which claimed.