The Israeli military has intercepted a Gaza-bound aid ship, detaining 21 international activists and journalists and seizing all cargo, including baby formula, food, and medicine, according to the Freedom Flotilla Coalition.

For years, Gazans haven’t had free access to this precious natural resource. Israeli limits on fishing activities have fluctuated with tensions with Hamas, with limits of just three nautical miles and even previous total bans on fishing imposed at times.

Israel has long restricted aid to Gaza on the argument that Hamas steals it to use as a weapon of control over the population. On Saturday, the Israeli military announced new airdrops of aid.