They had gone on strike at noon in protest against the killings in the rally yesterday, and they had made their way to a nearby police station where they were singing and chanting. In particular, they yelled: 'Shia, Shia, Shia,' which is a reference to Hamas being funded by Iran.

Within a few minutes, baton-wielding police laid into the girls. Some fell to the ground, but most ran away.

As this was happening, some other members of the police force grabbed me and dragged me into a cell. They pushed me against the wall, and one of the officers shouted: 'Hit him, hit him, hit him' in Arabic.

They snatched the camera from me, and one of the police officers urged his colleagues to break my camera. Then, my cameraman was dragged into the room too.

Another police officer, more senior than the others, eventually arrived and insisted on viewing the videotape that my cameraman had. I kept telling them that I was a journalist and that I would telephone the chief of police unless I was released, and eventually they did so.

Today's incident follows two previous incidents yesterday, in which my activities as a journalist were deliberately curtailed...

Hamas security forces in Gaza violently put down a protest by female pro-Fatah students, temporarily detained a British journalist, and arrested hundreds of senior Fatah members today, a day after seven were shot dead at a mass rally...