Political violence an increasingly common occurrence in the USpublished at 17:13 British Summer Time 14 June
Anthony Zurcher
North America correspondent

Officers at the scene of the shootings in the Minneapolis suburb of Brooklyn Park, Minnesota
The tragedy of another high-profile episode of gun violence in America is compounded by the political nature of this attack.
Two Democratic legislators were targeted, along with their families, in their homes. Partisan politics in Minnesota, a state that prides itself on its friendly, easy-going attitude, has been more heated recently.
Control of the legislature has repeatedly shifted between the two parties since last November’s general election, as the state held contentious special elections to fill vacated seats.
Political violence is nothing new in America, but it has become an increasingly common occurrence.
Prominent incidents include the arson attack on Pennsylvania Governor Josh Shapiro’s house, the assassination attempt on Donald Trump and the hammer-wielding assailant who broke into former Speaker of the House Nancy Pelosi’s San Francisco home.
Security around the president and high-profile national politicians is tight, but there are thousands of state and local elected officials with minimal protection.
Today’s attack – said to have been conducted by an assailant, or assailants, posing as law enforcement officers - is a particularly chilling reminder of this.