Following investigators' failed arrest attempt on 3 Jan, Yoon's security service fortified his compound using barbed wire and buses as barricades.

But investigators and police showed up this morning with the tools to overcome these obstacles: wire cutters and ladders.

They bypassed the parked buses by climbing over them, and cut through barbed wire.

While dozens of ruling party lawmakers formed a human wall in front of the compound to block investigators from reaching Yoon, some managed to get access to the presidential residence through a nearby hiking trail, local media reported.