MOSCOW (AP) _ A 19-year-old woman who was severely burned in last month's bomb explosion in central Moscow died early Monday, bringing the death toll in the blast to 13, the Moscow city health department said.

Police have reported no breakthroughs in investigating the explosion, which ripped through a passage under Pushkin Square on Aug. 8 during evening rush hour. Authorities suspect that feuding criminal gangs or Chechen rebels were behind the bombing.