Japan's top police chief, Itaru Nakamura, has announced that he intends to resign following a review of security related to the shooting of former Prime Minister Shinzo Abe, local media reported on Thursday.

Nakamura previously expressed regret for the failure of the police to protect Abe at his appearance at a campaign rally on July 8 and admitted there were flaws in the protection plan for Abe.

According to the review released on Thursday by Japan's National Police Agency, the shooting was caused by the lack of a systematic response and deficiencies in the plan for Abe's speech. The agency has pledged to improve its involvement in providing protection.

The head of the Nara prefectural police, Tomoaki Onizuka, also announced his resignation over the shooting.