<br/>The Centre has asked naxal affected states to take all precautionary measures to thwart any attempt of violence by the Maoists, in view of the two day bandh called by them from today. The bandh is to protest the killing of Naxal leader Azad in Andhra Pradesh last week. <br/><br/>The railways have given a general security alert with detailed instructions to ensure the protection of its properties, rail tracks and passengers during the 48 hour bandh. Quick response teams have been deployed at sensitive stations and track patrolling intensified. <br/><br/>The night operations of trains carrying passengers in the naxal affected areas will continue to remain suspended and speed restrictions have been introduced at sensitive segments. The railways have also cancelled four trains and diverted the routes of six trains Our correspondent says that the security measures by the railways comes as nearly 150 people had lost their lives following the derailment of Jnaneshwari Express in West Bengal by Maoists on the 28th of May.<br/>