Hackers Saturday attacked 20 Bangladeshi district websites operated by the Prime Minister's Office. The hackers who claimed to be Indians threatened Bangladesh with a cyber war if any Pakistani terrorist enters India through Bangladesh, leading English newspaper The Daily Star reported on Sunday. The Bangladeshi Home Secretary Abdus Sobhan Sikder said they have already restored the websites and cyber-crime experts in the elite force Rapid Action Battalion and Special Branch of Police are working to detect the hackers. 'Earlier such incidents took place but the hackers were detected. Now we are also hopeful of tracing the hackers,' he said at Saturday night. After the sites were hacked they flashed some Hindi letters. In instant reactions, Yeafesh Osman, State Minister for Science and Information and Communication Technology, said that the related body has started working to get the sites back up. Lt Col Ziaul Ahsan, director intelligence wing of the Rapid Action Battalion, said, 'We have been informed of the matter and are working to track down the hackers.' He said the hackers broke into the system apparently to get ' secret information'. The government has recently launched websites for 64 districts in a move to achieve Digital Bangladesh by 2021. Access To Information (A2I) project of Prime Minister's Office maintains the websites. 