Meer Hamza, Mohammad Alam, Dau and Santosh Duggal were arrested from Teen Pani area on Haridwar-Dehradun road yesterday by Uttarakhand Police's Special Task Force, SSP STF P Renuka Devi said today.
A 11 ft long and 7 ft wide tiger skin, a skull and bones weighing 25 kg were recovered from their possession, she said.
A case under the Wildlife Protection Act has been registered against the accused at Raiwala police station and they are being interrogated, the official said.