Police officers on duty at the venue where former Japanese prime minister Shinzo Abe was shot didn't recognise a suspicious man in the crowd until hearing the first gunshot, Japan's public broadcaster NHK reported on Saturday.
The identities of around 4,000 bodies collected following the March 11 9.0-magnitute earthquake and ensuing tsunami still remain unconfirmed, the country's National Police Agency has said.
News reports cited police as saying they suspected blast in the capital of Taipei had been caused by some kind of explosive in the train carriage.
A United Nations human rights investigator has recommended that international pressure be put on North Korea as part of a multi-pronged strategy to know the fate of hundreds of foreign nationals allegedly abducted by it.