A small boat carrying pro-Palestinian activists sailed into Gaza's port on Tuesday, in defiance of an Israeli blockade on the coastal territory. The boat was the fourth to reach Gaza from Cyprus. They say they want to highlight the damaging effects of Israel's blockade. The closure was imposed after Hamas seized power last year. Israel has halted two other boats bound for Gaza - one from Libya and one carrying Arab activists from Israel. Among the new arrivals Tuesday were British activists who advocate a boycott of Israel's universities, as well as a Gazan man who left the territory years ago.