Officials, led by sub-divisional magistrate M P Singh, seized the trucks from Titli and Ahmad Ghar last evening.
Seven trucks were seized from Titli and five from Ahmad Ghar, an official said.
The drivers were later released on bail, the official said.
The drive was carried out after the Aditya Nath Yogi government issued direction to the authorities to check illegal mining on the Yamuna riverbed.
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