India has repeatedly raised with China the issue of construction of a dam by them on Brahmaputra river and it has consistently denied any such engagement, Foreign Secretary Nirupama Rao said on Wednesday (November 4). "What I want to say is that this matter has been taken up not just once but on a number of occasions with China and China has consistently denied that it is engaged in any such construction activity on the Brahmaputra," she said here. She was replying to a question on the reported construction at the Zangmu site on the Chinese side of the Brahmaputra river, which was confirmed by the National Remote Sensing Agency (NRSA) as per media reports.