Sixty-three boxes containing 12,000 gelatin sticks and four boxes with 3,008 detonators were seized and one person arrested in Karivali area of Thane district's Bhiwandi township, police said on Tuesday.

Acting on a tip off, a team of Thane police's Crime Branch Unit I on Monday raided the premises of a firm on Chinchoti Road dealing in building materials and undertaking quarry contracts, said Senior Inspector Krishna Kokni.