Police have arrested four men in Detroit over the past week for posts on social media, which the police deemed to be threatening. 

The arrest comes after the shooting dead of five police officers in Dallas last week. One of the offending tweets stated that Micha Johnson, the shooter, was a hero. 

Detroit Police Chief James Craig said "I know this is a new issue, but I want these people charged with crimes. I've directed my officers to prepare warrants for these four individuals, and we'll see which venue is the best to pursue charges." 

The Dallas shooting was the worst attack on the US police force since 9/11. Law enforcement officials are now, understandably, more sensitive towards threats against any of their members.

Those arrested have been charged with "inciting injury to persons or property", "disorderly conduct" and "public intimidation".