Cracking the whip on illegal sand mining in the district for the second day, the Vigilance and Enforcement sleuths seized 13 sand lorries in separate raids in the district on Sunday. The vigilance officials intercepted nine vehicles for transporting sand without any permission in Guntur, and four vehicles were confiscated in another raid at Kolluru village, said Regional Vigilance and Enforcement Officer R.N. Ammi Reddy..