Indonesia\'s president ordered an investigation into a bridge collapse that left four people dead, 16 missing and 43 others injured, an official said Sunday.Welfare Minister Agung Laksono said President Susilo Bambang Yudhoyono ordered the probe be started immediately to ascertain the cause of the 4:30 p.m. Saturday collapse of the Tenggarong Bridge over the Mahakam River in Kutai Kartanegara, East Kalimantan, The Jakarta Post reported.National Disaster Mitigation Agency spokesman Sutopo Purwo Nugroho said the bridge was being repaired when it toppled into the river.