The boy, who suffered a head injury, was riding a toy vehicle that his grandfather was pushing when they were hit crossing Conant Steet, within sight of their Netre Dame Avenue apartment, police said wrote a US-based news portal, the unionleader.com.

Mausham was listed in critical condition at Massachusetts General Hospital in Boston, while Kubirlal was at Catholic Medical Center with non-life threatening injuries. According to the portal, his condition wasn't available.

Police said speed and alcohol did not appear to be factors for the accident. They identified the car's driver as Joshua Bouchard, 19, of 153 Whipple St. Bhutan News Service

"According to camp secretary of Beldangi-I, T B Gurung, Adhikari was a resident of Beldangi-I, sector D/3 before getting relocated in the USA.

"This is a serious case and I hope he will be taken care well", said Gurung recalling, "Mausham was a playful boy in camp".

"He has his uncle and aunts still left in the hut", he added. Bhutan News Service/Vidhyapati Mishra