LONDON, ON - Provincial police have identified the two people killed in a collision on Hwy. 401 in Chatham-Kent Monday evening.

Swaminathar Tharmart Selvakumaran, the 41-year-old male driver, and Muthuluxmiammal Shanmugaretnam, a 78-year-old female passenger, died when their Toyota minivan, with three others inside, crossed the centre median near Drake Sd. Rd. and struck a transport truck head-on.

"The impact tore the rear wheels off the trailer," Const. Troy Carlson said.

The tractor-trailer skidded for 200 metres, with sparks shooting from the rear, igniting a small grass fire.

A three-year-old boy from Toronto was transported to Chatham Health Alliance Hospital and later airlifted to Victoria Hospital in London, where he remains in critical condition.

A 35-year-old woman from Toronto, whom police initially believed to be a teen, was also transported to Chatham Hospital in critical condition and later transported by ambulance to Victoria Hospital, where she also remains in critical condition.

A 56-year-old man from Toronto was transported to Chatham Hospital with minor injuries.

Carlson said the toddler had been properly restrained in a car seat. The crash happened just after 6 p.m. under sunny skies.