A trio of opposition parties have requested a parliamentary investigation into the cause of the Itaewon crowd crush.

The main opposition Democratic Party(DP), the Justice Party and the Basic Income Party were joined by a group of independent lawmakers that had defected from the DP in submitting the request Wednesday afternoon. A total of 181 lawmakers, accounting for slightly over 60 percent of the unicameral parliament, joined the move.

The DP has criticized the National Police Agency for leading the investigation into the agency’s response to the crush widely considered deficient.

The ruling People Power Party(PPP), for its part, opposes the parliamentary probe at this time, saying priority should be given to the outcome of the police investigation.