This story is confirmed: striking teachers are being violently ousted by military with teargas (L.1500 per canister) from the UPNFM (National Pedagogical University "Francisco Morazán") as I write this. This picture was posted to Facebook by a witness, who wrote:

sadistic brutes, a man almost died in front of me from that damn gas!!! violent repression!
sadicos represores un senor casi se muere frente a mi por ese maldito gas!!! violenta represion!

Union leaders are calling for everyone to come to the UPN, and meanwhile soldiers have entered the neighboring mall Plaza Miraflores and are ousting people from there. TV and Radio Globo are reporting on it.