A local court in Hyderabad on Tuesday allowed the CBI to obtain specimen signatures and handwriting of former Satyam chairman B Ramalinga Raju and four other accused in the Satyam fraud case, all of whom are now in the Chanchalguda jail.

The four others are former Satyam Managing Director Rama Raju, former CFO Vadlamani Srinivas, and two former Price Waterhouse executives S Gopalakrishnan and Talluri Srinivas.

The CBI, investigating the Satyam financial fraud, will file the charge sheet in the case on April 9.