bomb-rigged truck with government plates exploded in Lahore on Wednesday, killing one person in a heavily guarded neighbourhood that is home to many government officials in the eastern Pakistani city. Two TV stations quoting anonymous intelligence officials reported that authorities had arrested an Indian national in connection with the blast in the city, which is around 19 miles from the Indian border. Lahore's police chief said his force had not detained an Indian, but said intelligence agencies could have done so without his knowledge. Tensions between nuclear-armed India and Pakistan have risen sharply over the deadly terror attacks in Mumbai last month, which Indian authorities have blamed on Pakistan-based militants. Islamabad has promised to cooperate with New Delhi, but has said it...