A Paraguayan opposition political activist was shot in the head and killed when police raided his party headquarters during riots against a contested electoral reform, the movement's leader said Saturday. Rodrigo Quintana, 25, leader of the opposition Liberal Party's youth branch was shot as police searched the premises in the capital Asuncion, party leader Efrain Alegre told reporters. The interior ministry said in a statement that "the authorities are investigating the circumstances of the death, which is presumed to have occurred at the hands of a member of the National Police.