Nu? And What was That?

The other day while traveling by bus from Shiloh in the direction of Jerusalem on Road 60, there was strange stoppage by Givat Asaf, the junction to Beit El. I was sitting in the bus in the front, and this is what I saw:



While we passengers and the driver began discussing the possibilities, it suddenly cleared. Traffic moved, and the police/soldiers went back to wherever... So, what was it?