In a statement issued on Monday May 18, the Public Security ministry said; "We want to warn whoever will try to destabilise the elections that the police and its security partners are instructed not to tolerate any disruption."
This comes after violence between the ruling party youth wing Imbonerakure and National Congress for Liberty (CNL) militants marred the 21 days of campaigning, leading to the killing of four people, according to the government.
The ministry has also asked supporters of opposition parties CNL and Uprona to cast their votes peacefully, "and return to their homes immediately after the vote.
Mr Rwasa has spoken of continued attacks on his CNL party supporters and members, and also alleged that this is specific on candidates or their electoral observers.
Confrontation between the opposition members and ruling party's youth wing Imbonerakure have been reported countrywide specifically in the provinces of Ngozi, Kirundo, Kayanza, Bujumbura and Gitega.