You're right we are early into that event. It's still not clear how the arrest played out: (a) they were grabbed along with "rioters" and later turned out to be journalists on the side or (b) they were with media badges and video cameras clearly covering the riots on the ground, then still arrested as a sign of force. Sadly journalists get arrested relatively often, but it's important to insist that medics should be aimed at as rarely as possible, despite the heat of the moment.