Investigators say "Metro Transit Assassins," also known as "MTA" is an elite tagging crew with only ten members. The crew uses the Metropolitan Transportation Authority logo and their favorite tool is a spray can.

MTA's favorite tagging spots are on freeways, trains, trucks and anything that gets their name around.

Deputy City Attorney Jim Mcdougal says the taggers actually rented a helicopter to scope out the LA River Bank.

Now Sheriff's deputies have served MTA with the first ever gang injunction against a tagger crew.

Chris Blatchford has more on the injunction in this video report.