Expressing sorrow over the loss of lives in the bridge collapse mishap in Arunachal Pradesh, Congress President Sonia Gandhi today asked authorities to take all necessary relief measures. A party release in New Delhi said, Mrs. Gandhi has asked the local authorities to place all relief measures for service of the affected people.Six people had been killed and 25 are missing after a wire-rope suspension bridge collapsed last evening at Seppa in East Kameng district. Police said, the hanging bridge over the Kameng river at the entrance to Seppa town collapsed as people were crossing it.Officials said, 29 people have been rescued so far and the condition of five among them is serious. They said, the rescue operation is still continuing and 25 people are still missing.