Marathon discussions have begun in Copenhagen in the final leg of climate change conference which comes to an end tomorrow. Several heads of the states and governments have already joined the summit level deliberations.<br/><br/>Prime Minister Dr. Manmohan Singh will be joining the deliberations after his arrival later tonight. Prime Minister Dr Manmohan Singh has left for Copenhagen scheduled a short while ago. <br/><br/>Earlier, Dr Singh's departure has been delayed following his special aircraft developing a technical snag. Speaking to newsmen on the incident, Mr. Praful Patel said that high level inquiry has been ordered by both Air India and Directorate General of Civil Aviation.<br/><br/>The US President and the Chinese Premier are also expected to reach Danish capital .<br/><br/>Violent protests were witnessed at the snow-affected Bella Center leading to the most unruly scenes yesterday. The police said 260 people were arrested during the protests , in which demonstrators also tried to scale fences and descend on the conference center. The protest continued even today. Regretting the absence of an agreed text just a day ahead of the Summit level talks, India's Environment Minister Jairam Ramesh said the entire process of negotiations have been very badly handled. After India's meeting with other BASIC countries – Brazil, South Africa and China – for almost three hours last night to discuss the plan of action, Mr Ramesh expressed hope that a draft will be ready before the summit level talks begin.