(Updates with more detail of cyberattack, time of rescheduled speech)
June 17 (Reuters) - The Kremlin said on Friday that the St Petersburg International Economic Forum had suffered from a "denial of service" cyber attack on its accreditation system, forcing Russian President Vladimir Putin to delay a scheduled address by one hour.
Kremlin spokesperson Dmitry Peskov said in a call with reporters that the cyber attack had begun on Thursday and disabled the forum's guest accreditation and admission system, leading to a host of problems with access.
He said specialists were working to fix the problem, and that Putin's keynote address had been moved back to 3 p.m. (1200 GMT). (Reporting by Reuters; Editing by Kevin Liffey)