The death toll in Tuesday's wreck of a high-speed train rose to 28 Friday, and authorities said railway workers who failed to warn the engineer of imminent danger face criminal charges, Soviet television said.

The official news agency Tass said none of the casualties were foreigners.The high-speed Leningrad-Moscow express train Aurora, carrying 686 passengers, careened off the tracks Tuesday evening and burst into flames, Tass said.

Twenty-two people were killed outright, and another six, among the 107 people hospitalized, died later of their injuries, Soviet television said.