Dhaka, March 22 -- Biman Bangladesh has been unable to retrieve its email server, which was hacked five days ago through the use of ransomware, a type of malware that can take over the control of a computer or a server.

The hackers have demanded a large ransom. State Minister for Civil Aviation and Tourism Mahbub Ali said a committee has been formed to investigate the incident.

The server was attacked with ransomware on Friday, said Biman officials. The hackers demanded a ransom when people tried to log in or open a file on the server.

As the server was hacked, the national carrier could not conduct any domestic or international correspondence using its official email. There is a risk of information being leaked as the officials use Bi...