Authorities investigate reports of 80 migrants trapped in truck in Texas

• 911 calls from around San Antonio received on Monday
• People could be heard calling for help in Spanish

US authorities are investigating reports that approximately 80 migrants may have been trapped in a tanker truck and were struggling to breathe, according an official with Immigration and Customs Enforcement (Ice).

The official said Ice's homeland security investigations unit was looking into 911 calls placed on Monday around San Antonio, Texas. During one of the calls, a male caller was breathing heavily as someone else shouted help" in Spanish, according to a recording. Moans of others could be heard in the background.