A parcel containing a threatening letter and suspicious powder was delivered to South Korean Defense Minister Kim Kwan-jin on Tuesday, ministry officials said, days after hundreds of leaflets threatening him were found amid high tensions with North Korea. 

"In the parcel addressed to defense minister with no sender name, the ministry found a threatening letter and unidentified powder," the ministry said in a release.

The ministry identified the parcel delivery as "an attempted terror" against the minister and formed an emergency team to analyze components of the white powder and trace the sender.

The letter was the same leaflet, which were distributed near the ministry in early Friday morning, officials said. It denounced Kim's hard-line stance on North Korea and threatened to "punish" him.

Investigations are currently underway to determine who were behind the leaflet distribution. (Yonhap News)