ANKARA, Turkey - Turkish tuna fishermen rammed their boat into a Greenpeace ship Friday and pelted it with lead fishing weights, the environmental group said. No one was injured. The fishing vessel was among several that swarmed the Arctic Sunrise, which was carrying activists campaigning against overfishing in the Mediterranean. The boat rammed the Greenpeace ship at high speed, said Yesim Aslan, a spokeswoman for the group. The barrage of lead weights damaged a helicopter that the activists had used earlier in the day to document the vessels' activities, Aslan said.