Anchor: Authorities demolished two boiler towers at a decommissioned thermal power plant in the southeastern city of Ulsan that had hindered efforts to find people trapped underneath the debris of a nearby third structure that collapsed last Thursday. The 63-meter towers on either side of the debris, which had been on the verge of collapse, fell almost simultaneously following detonations at noon Tuesday.
Kim Bum-soo has more.

Report: Authorities brought down two boiler towers standing on either side of a pile of rubble, inside which four workers are trapped.

[Sound bite: Controlled demolition of fourth and sixth boiler tower at Ulsan thermal power plant]

Clouds of dust covered the demolition site in the southeastern city of Ulsan as the 63-meter steel structures fell within seconds of the controlled demolition. 

The shock waves could be felt up to 300 meters away, and fragments were sent flying.

Search operations at the ruins of the 5th boiler tower had been delayed due to the possibility that the adjacent 4th and 6th towers could fall.

The middle structure collapsed Thursday during demolition work at the decommissioned thermal power plant, killing at least three.

Three of the seven people who were initially trapped underneath have since been found and pronounced dead.

Search operations resumed Tuesday afternoon with cranes and other heavy-duty equipment. 

The death toll is only expected to rise, with two individuals who have been located beneath the rubble presumed dead and two still unaccounted for.
Kim Bum-soo, KBS World Radio News.