The department warned about the dangers of carbon monoxide poisoning from trying to stay warm in a car with exhaust pipes blocked by snow.

CNN: STORY HIGHLIGHTS

Authorities said Mr. Sen was trying to stay warm in an enclosed area of the elevated station and didn't notice his attacker before he fell on the tracks.

WSJ: Subway-Push Suspect's Past

We spent the afternoon laughing and trying to stay warm.

WSJ: Man Versus the Volcano