Crews clear debris from houses destroyed when a tornado devastated Joplin on May 22. (SARAH CONARD/REUTERS)

Several agencies are working together to remove debris that could release potentially harmful dust into the air. In a bit of good news, initial air quality tests conducted by the Environmental Protection Agency did not detect any asbestos.

Watch the memorial service for those killed by the massive tornado at the Peace Lutheran Church.

(Source: Associated Press)