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It is part of a new aid system - widely condemned by humanitarian groups - aimed at circumventing the UN which Israel has accused of failing to prevent Hamas from diverting supplies to its fighters.

The facilities are part of a new aid system - widely condemned by humanitarian groups - aiming to bypass the UN, which Israel has accused of failing to prevent Hamas diverting aid to its fighters.

Detectives say they have observed growing sophistication in criminals diverting and intercepting valuable goods being trucked into and out of Southern California in recent years.

Jonathan Whittall, the head of the UN's humanitarian office for the occupied Palestinian territories, also said there was no evidence that Hamas was diverting aid coordinated through credible humanitarian channels.

Israel and the US accuse Hamas of diverting aid.