A family was en route to the U.S. when they were attacked Saturday in the Mexican state of Tamaulipas. The shooting is similar to one in which nine Americans were killed driving in Mexico in November.

Chicago's mayor called the shootings "a terrible tragedy" and an "incredible act of cowardice." She urged witnesses to "overcome their fears and come forward with information" to help police.

As a leader of the Patriot Movement, the Republican representative, "planned, engaged in, and promoted a total of three armed conflicts of political violence against the United States government."

The shooter killed himself after killing two and injuring two more, police said.

"It looked like a battlefield for just horses — we counted 15 that we found dead," Floyd County Sheriff John Hunt says.

New Jersey Attorney General Gurbir Grewal said investigators believe the deadly attacks were "potential acts of terrorism." Meanwhile, members of the Jewish community mourned their lost neighbors.

"Parkland Rising" follows students leading March For Our Lives, grieving parents and others who used the tragedy in Parkland to change the national conversation about gun reform.

Pending further investigation, Mayor Steven Fulop refrained from assigning a specifically anti-Semitic motive in the shooting Tuesday that left six people dead, including one police officer.

Training medical providers to ask patients about firearm ownership and storage will save lives and promote better safety practices, the city's health and human services chief told lawmakers Tuesday.

A police officer and multiple other people were killed in a furious gunbattle Tuesday in Jersey City.