2205 GMT: That last update appears to be even more significant than we originally thought. First of all, an opposition Facebook page says that there were clashes between anti-government protesters and Bahraini police yesterday in the village of Al Dair. Apparently, there was another protest in Al Dair tonight (see a photo gallery posted by activists).
But the significant piece of evidence is this video, which shows a crowd being attacked by plain-clothed men. The attackers then appear to grab a young boy and drag him away. Towards the end of the video, a white van, which appears to be similar to one used by police, appears in the frame, suggesting that the plain-clothed men are the same as the ones in the last video and are working with the police. At the very end of the video, a policeman appears and fires teargas towards the now-scattered crowd, confirming this suspicion:
A daytime rally, reportedly today in Al Dair village: