The number of missing people from a devastating tornado that hit Joplin, a city of 50,000 in southwestern Missouri, on May 22 reduced to 29, while Missouri officials continued the process of identifying the remains of bodies recovered.

As many as 113 victims have been positively identified and their relatives notified, the Missouri Department of Public Safety said Monday. Of the 113 who have been identified, 13 were under the age of 18.

Officials had reported 146 sets of human remains from the tornado, a number unchanged since Sunday. There is a chance that the remains of one person are in more than one set, they have said.

On Monday, officials said 29 people remain unaccounted for, down from 43 Sunday. The official death toll was last reported at 139 as of Saturday.

The tornado that hit Joplin with winds of nearly 200 miles per hour (328 km/hour) was the deadliest single twister in the United States since 1947.

President Barack Obama visited Joplin on Sunday, vowing to cut through federal red tape to help rebuild the city.

Up to 5,000 residents have registered with the Federal Emergency Management Agency for disaster aid. 3,000 volunteers are helping with the disaster clean-up effort. Much of the work is centered on clearing debris, such as cutting up felled trees and piling up damaged items from people's homes, Joplin City manager Mark Rohr told Reuters.

The tornado that struck Joplin had its rating changed from EF4 to EF5 (the highest rating for a tornado), according to the survey by National Weather Service.

In addition to at least 139 people killed and more than 900 injured, scores are still unaccounted for more than a week later. The tornado churned through a stretch nearly a mile wide, damaging about 8,000 buildings in Joplin.

Take a look at the fresh set of aftermath photos: