Eyewitnesses said that two civilians were injured in clashes between pro revolution armed tribesmen and republican guards in al-Hoban and Kalabah area of Taiz, near change square Tuesday night.
Light gunfire was then heard in the city for the next two hours.
Fierce clashes continued for 20 minutes in the city. No protesters were reported injured.
Clashes in Taiz calmed down over the last two weeks after intensive fighting between armed gunmen from Sharaab and Mikhlafi tribes who took over most parts of Taiz city after governmental forces attacked and killed dozens of youth protesters.