More than 50 Irish immigrants may have been murdered in 1832 in Philadelphia. Bette Browne reports on the excavation of a mass grave to find out what happened in the forgotten massacre

The remains of five Irish immigrants murdered while building a Pennsylvania railway in 1832 are being re-interred in a cemetery near Philadelphia.

US researchers may have discovered a mass grave for nearly five dozen 19th Century Irish immigrants who died of cholera weeks after travelling to Pennsylvania to build a railroad.