Prosecutors have imposed a travel ban against the leader of the Unification Church amid an investigation into former first lady Kim Keon-hee allegedly receiving luxury gifts from the church.

According to legal sources on Thursday, the Seoul Southern District Prosecutors’ Office imposed a travel ban on Han Hak-ja.

Han is currently a witness, but the prosecution has not ruled out the possibility of her being a suspect in the bribery case.

The prosecutors are currently looking into an allegation that a high-ranking church official gifted the former first lady a diamond necklace worth 60 million won, or over 43 thousand U.S. dollars, and two luxury bags via a shaman named Jeon Seong-bae, better known as Geon Jin.

Authorities suspect that the handover of gifts proceeded either under Han’s instructions or with her tacit approval.