On a tip-off, Ghaziabad police raided the hotel last night located at Inder Gadhi under Mussorie police station and seized cash worth Rs 9.80 lakh, more than 100 mobiles, 18 luxury cars, arms and ammunition, Deputy Superintendent of Police Ran Vijay Singh said.
Illegal casinos were found operating in the hotel, he said, adding, girls were seen serving liquor.
In some of the rooms at the hotel, couples were found in compromising positions, he said.
Those arrested are mostly businessman from Delhi and Faridabad, he added.
"We are checking the antecedents of the detainees and investigation is underway," Singh said.