CAIRO (Reuters) -Organisers of a march to the Egyptian border with Gaza said on Tuesday that three participants were abducted by plainclothes officers in Cairo amid a wave of arbitrary detentions, deportations and abuse by security forces.

Dozens of Canadians are expected to be among thousands of other activists gathering in Egypt this week ahead of a global march to its Gaza border as they call for an end to Israel's siege on the territory.

The Global March to Gaza is a civilian-led initiative to march from Arish, Egypt, to the Rafah border crossing with the Gaza Strip beginning on Sunday. Once in Rafah, the goal was to set up a camp and work to break the Israeli blockade of Gaza, provide humanitarian aid to the strip and protest against Israel's actions in the territory.