Gurgaon: A 42-year-old woman and her son, 18, were mowed down by a truck on the Delhi-Gurgaon expressway killing both of them on spot, police said on Thursday.

Santosh Devi was returning to her home in Chakkarpur village on Mehrauli-Gurgaon (MG) road with her son Anand after visiting a relative's house in Jharsa village close to Sector 32.