Two rockets were fired into a U.N. compound near an election centre in the Afghan capital on Sunday as polls opened in legislative elections, slightly wounding an Afghan worker, an election official said. One of the rockets failed to explode at the compound in the eastern outskirts of the city, about 2 km (one mile) from an election commission media and counting centre, said Bronwyn Curran, spokeswoman for the joint Afghan-U.N. commission. "One national staff member was slightly injured," she said. "It's a very minor incident."