The German Federal Prosecutor’s Office says it is investigating a number of internet providers because they were giving subscribers access to a radical left-wing electronic newspaper. The firms are suspected of inciting criminal activity and advertising for a terrorist group because they had failed to block access to the left-wing radikal 154 internet page, which includes instructions on how to sabotage railway lines. On Friday, the page was still available via CompuServe Inc, America Online Inc and T-Online, the on-line service offered by the leading subversive, Deutsche Telekom AG. America Online said it was technically impossible to block the server where radikal originated, and the page was anyway now available via at least 30 other servers and in thousands of electronic copies.