TIJU.N, Mexico – Police in the border city of Mexicali have arrested a purported top figure in Mexico's powerful Sinaloa drug cartel, authorities said Friday.Baja California state police arrested Manuel Garibay on Thursday while he was driving in Mexicali, across from Calexico, California, the state public security department said in a statement.Garibay, 52, was the Sinaloa cartel's link to