The Israeli navy stopped the activists' boat off the coast of the Gaza Strip on Tuesday

"They forcibly boarded the ship, detained all our passengers and illegally took them to Israel against their will. This is a kidnapping. This is the act of piracy at sea," Ramzi Kyzia, an activist from the Free Gaza Movement, told a news conference in Cyprus.

Among those detained with Maguire were Cynthia McKinney, a US congresswoman