GAUSHALA: Cadres of the United Democratic Madhesi Front (UDMF) have been staging demonstrations at three border points on the Nepal-India border in Mahottari since this morning. The demonstrations have been organised at Matihani, Sakshi and Vittamod-based border customs points as part of the UDMF's protest against the newly promulgated constitution, the UDMF said. As a result, vehicles entering Nepal from India have been obstructed. Supporters of the UDMF have been staging demonstrations in Tarai for the past one-and-a-half month, putting forth various demands.