A mass shooting at a Walmart store in El Paso, Texas on Saturday left 20 people dead and 26 injured.
The alleged attacker, a suspected white supremacist, is in custody.
Not long after, a mass shooting in Ohio left nine people dead and at least 26 injured.
That second mass shooting in the space of 24 hours took place in Dayton city, Ohio at 1AM Sunday, local time.
Police named the gunman as Conner Betts, a 24-year-old white male.
He was killed by police just one minute after he started his shooting spree.
His 22-year-old sister is known to be the youngest victim.
Police found a shotgun in the suspect's car and said the guns were purchased legally.
As the area is a popular spot with many shops and restaurants, the area was full of people at the time of the attack.
The motive is not yet known.
Speaking a few hours ago, U.S. President Donald Trump expressed his condolences over the recent tragedies.
"Hate has no place in our country. We have to get it stopped. This has been going on for years, for years and years in our country, and we have to get it stopped. So thank you very much. And I will be making a statement tomorrow at about 10:00 and I'll see you there. Thank you very much."
According to the police, there's no evidence that the shootings in Texas and Ohio are linked.
KIM Da-mi, Arirang News.