Federal authorities expressed increased alarm Thursday about a long-undetected intrusion into U.S. and other computer systems around the globe that officials suspect was carried out by Russian hackers. The nation’s cybersecurity agency warned of a “grave” risk to government and private networks.

Bangladeshi banks need to adopt an advanced cybersecurity system in line with the regulatory guidelines amid concern that the infrastructures in the country’s banking sector dangerously lags behind, experts told a seminar on Tuesday.