Imphal/New Delhi, June 10 -- Former Manipur chief minister N Biren Singh, along with Bharatiya Janata Party (BJP) Rajya Sabha member Leishemba Sanajaoba, on Monday arrived in Delhi to brief central leaders on the escalating tensions in the ethnic strife-torn northeastern state. Meanwhile, Imphal city remained tense for the third straight day during the 10-day bandh called by Arambai Tenggol, a prominent Meitei group, against the arrest of its five members, with incidents of violence being reported from different parts of the state's capital. After arriving in the national capital, Biren Singh and Sanajaoba went to Union home minister Amit Shah's residence late in the night, officials aware of the matter said. Earlier talking to reporters at the Imphal airport before leaving for Delhi, Singh said: "I am leaving for Delhi with Sanajaoba to apprise the state's situation to central leaders. I want to appeal to all, including mothers and brothers, that this is a crucial stage for the state, and everyone should be very careful in what they do and say." Singh, who resigned as the CM in February prompting the imposition of President's Rule, however, evaded a question whether Shah had summoned them. An official in Delhi aware of the development, however, said, "The home minister's office had called the former chief minister last night (Sunday). The exact details of the meeting is not clear yet but it is possible that the meeting with HM is related to the ongoing violent protests and the shutdown announced by the Arambai Tenggol in the valley." The meeting, according to the official, was urgent because Meitei groups in the valley have given an ultimatum to legislators to form a government, failing which they have threatened to protest. The ministry of home affairs (MHA) officials on Monday held a meeting with representatives of the Kuki-Zo insurgent groups, which are currently under the Suspension of Operation (SoO) pact with the Centre, over the renewal of the SoO agreement. While the government is yet to comment on the details of the meeting, people aware of the matter, said ministry of home affairs officials insisted on ensuring there is no hindrance from Suspension of Operation groups on the free movement of people across the state and relocation of the camps from certain civilian areas, while the Suspension of Operation groups insisted on new ground rules before the Centre renews cessation of hostilities pact. The meeting was significant as it was the first meeting held between Centre and Suspension of Operation groups since the pact was put in abeyance last year....