Gunmen on motorbikes in India’s West Bengal ambushed and killed a political aide from the ruling Hindu-nationalist party days after it swept state elections, police said on Thursday. Prime Minister Narendra Modi’s Bharatiya Janata Party (BJP) won a resounding victory on Monday in the eastern state of more than 100 million people, taking 207 of the 294 assembly seats, for its first-ever state victory in West Bengal. Chandranath Rath, 41, a close aide of West Bengal’s BJP chief Suvendu Adhikari,...