Shortly over three hours after police were alerted to a mass shooting in Buffalo, New York, on Saturday, Democratic politicians took to Twitter to call for gun control legislation.

“Two mass shootings in 24 hours, in Milwaukee and Buffalo — the latter killing ten people. I’m heartbroken. And I’m angry. Angry that the GOP continues to block even the most basic gun safety measures. We can stop this. We can save lives. Republicans just refuse to. Cowards.” said Democratic Representative Adam Schiff of California in a Twitter post.

The alleged shooter, later identified in court as 18-year-old Payton S. Gendron, reportedly traveled several hours from Conklin, New York to Buffalo where authorities said the gunman exited his vehicle with a firearm and shot four people in the parking lot, three of them were fatally wounded, the New York Times reported. A retired Buffalo police officer who was working as a security guard at the store was fatally shot by Gendron who continued firing upon customers and employees inside the store, the outlet noted.