Lebanese troops on Saturday set up checkpoints and searched cars going in and out of a Palestinian refugee camp near the northern city of Tripoli where a militant group blamed for last month's deadly bus bombings is based, camp residents and military officials said. Soldiers searched all vehicles entering or leaving the Nahr al-Bared camp and banned media and Lebanese citizens from going inside. Schools in the camp were closed and Palestinian students who study outside Nahr al-Bared were prevented from leaving, said camp residents reached on the phone. The residents declined to give their names because of the sensitivity of the situation. They said many shops inside the camp, which is home to about 30,000 Palestinians, had closed and that traffic was light.