Mexico City: The US National Transportation Safety Board has sent a team of investigators to Mexico to probe the helicopter crash that killed the country`s No 2 official.
The board says it has also sent representatives of the Federal Aviation Administration to investigate Friday`s crash in a rural area south of Mexico City. The crash killed Interior Minister Francisco Blake Mora and seven others.
The safety board said in a news release on Sunday that Mexico requested help. The agents arrived Saturday.
President Felipe Calderon has asked Mexico`s transportation secretary to carry out a thorough investigation into the causes of the helicopter crash.
Mexico`s Transportation and Communications Department will remain the lead investigative agency.