A South Korean man walks by wrecked vehicles after a landslide in Seoul, South Korea, Wednesday, July 27, 2011.

A quick blast of heavy rain sent landslides barreling through South Korea's capital and a northern town Wednesday, killing 19 people and leaving one child missing, officials said. (AP Photo/Ahn Young-joon)

Residents pass by wrecked vehicles after the landslide.

Ten of the 13 people killed in an early morning landslide in Chuncheon, about 68 miles (110 kilometers) northeast of the capital, Seoul, were college students who had been doing volunteer work, said Byun In-soo of the town's fire station. They were staying in a resort cabin when the mud and debris engulfed them. Also killed were a married couple and a convenience store owner.

About 500 officials and residents worked to rescue people trapped in the mud and wreckage. Twenty-four people were injured and several buildings destroyed, officials said. 

In southern Seoul, six people were killed when a wave of mud crashed through residential areas at the foot of a mountain, said Lee Sun-myeong, a city official. The dead were not yet identified. One child was missing. (AP Photo/Yonhap, Kim Ju-sung)

Residents on a makeshift raft evacuate from a flooded area in Gwangju, South Korea.

About 15 inches (400 millimeters) fell in Seoul in just 17 hours starting Tuesday afternoon. More than 10 inches (250 millimeters) fell on Chuncheon in the last two days. Weather officials said another 10 inches could fall in northern South Korea, including Seoul, through Friday.

Fast-moving muddy water filled streets in Seoul on Wednesday, with people scrambling to the roofs of their partially submerged cars. Water filled some subway stations and spewed from sewers. TV images showed people in one flooded subway station using shovels, brooms and a wooden board in an effort to keep more rain from coming in. (AP Photo/Newsis)

A driver and a police officer push a stalled car on a submerged road in Seoul.

About 800 houses flooded, according to a city disaster official who declined to be named because of office policy. The official said 23 roads were closed in the city.

Local TV showed officials rescuing hikers stranded on mountainsides. People plodded down streets covered with knee-deep water, many barefoot, their pants rolled up. Cars were restricted from entering the lower part of a two-level bridge in the center of Seoul because it was submerged in water.

The Seoul Metropolitan Police Agency issued a traffic emergency, mobilizing more officers to deal with the problems caused by the heavy rain. (AP Photo/Yonhap)

Vehicles are stalled on Olympic Road, the capital's main road. 

Seoul officials said they were considering shutting down two major city highways stretching along each side of the main Han River because of rising water levels. Cha Jun-ho, an official at the government's Han River Flood Control Office, said a dam located just east of Seoul was discharging 16,400 tons of water per second. The dam discharged about 1,000 tons per second days before the recent downpours began.

About 60 houses were cut off from roads in Seoul's Hyeongchon village because of the heavy rain, and fire officials were trying to rescue them, a local officer said, declining to be identified because of office procedure.

People in Seoul, where smartphones are ubiquitous, posted dozens of photos on Twitter and Facebook showing inundated streets and mud-covered cars. Many complained online that Seoul had neglected to prepare for such downpours.

In Chuncheon, TV footage showed a town strewn with debris. Rescuers carried a dazed person covered in mud from head to toe on a stretcher. Others, also covered in mud, limped toward ambulances. Rescue workers in orange rain gear used shovels to move mud, and bulldozers cleared heavy debris.

Officials in Chuncheon had said earlier that 12 people were killed and two missing. Go Chang-ho, an official at the fire station, later said that one of the people first said to be missing had actually already been counted among the dead. Following a search, rescuers found the other missing person was dead and concluded 13 people had been killed in the landslide. (AP Photo/Yonhap, Jeon su-young)

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Associated Press writers So Yeon Kwon and Hyung-jin Kim contributed to this report.