In May 2010, Capucci participated in the Free Gaza Movement's aid flotilla to the Gaza Strip (see also Gaza flotilla raid). He was a passenger on , which was seized in the early hours of Monday, 31 May, by the Israeli Navy, with nine people killed and many injured. He was held in Beersheba prison and deported. During a reception for the return of the "Mavi Marmara" to Istanbul, he gave a speech to the assembly.