Metropolitan Police Service
Both vehicles were engulfed in flames in the aftermath of the incident.
He was one of three men in their twenties to be stabbed to death in 24 hours in London.
The 28-year-old from Staffordshire had been imprisoned in 2012 after plotting to bomb the London Stock Exchange.
The knifeman was known to the police and had links with terrorist groups, a security source said on Friday night.
Activists detained under "unlawful" police order face no further action after being arrested during October climate demonstrations.
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All of the victims were in their twenties.
Metropolitan Police is investigating controversial church facing "several very alarming allegations of sexual abuse" in wake of major HuffPost UK investigation.
Activists continued protests in the capital in defiance of the police order.
The boy – believed to be 18-months-old – was pronounced dead in hospital on Thursday.