for ostensibly "attacking the police", according to Yomiuri Shinbun (5/22/2012). If the past incidents are any indication, that would mean these two men got in physical contact with policemen, and that's called "attacking".
Yomiuri also reports 20 of the 22 trucks carrying 80 tonnes of disaster debris got inside, after 8-hour delays. The debris will be burned on May 23.
There were about 40 policemen against 30 or so protesters, according to Yomiuri.
By the way, Yasumi Iwakami's IWJ did the live netcast from early morning of May 22 for about 15 hours.
Portirland blog has the screen shots of the survey meter, with the highest radiation level at 0.612 microsievert/hour. The embedded video shows the measurement was done after the truck left the site. The survey meter went from 0.06 microsievert/hour or so to 0.612 microsievert/hour in about 2 and a half minutes.