VARAZDIN, Croatia (Reuters) -Twelve people were killed in Croatia on Saturday when a Polish bus filled with religious pilgrims slipped off a road and crashed near Varazdin, authorities said. Thirty-two people were injured in the crash which happened at 5:40 a.m. (0340 GMT) on the highway between Varazdin, in northwest Croatia, and capital Zagreb. Croatian Health Minister Vili Beros said 19 people were in a serious condition. Marcin Przydacz, deputy head of the Polish Foreign Ministry, who was travelling to the site on Saturday, said the injured were being treated at five hospitals in Croatia. …