They allege that the project included a plan, specifically thought up by al-Husseini, to poison the water supply of Tel Aviv.[14] The drop is said to have included several cardboard boxes containing a fine white powder consisting of a strong water-soluble poison. Each box is said to have contained poison sufficient to kill about 25,000 people. This part of the parachuted cargo is said to have gone astray, with the unit failing in attempts to recover them.