India, Dec. 23 -- Dense fog caused a massive multi-vehicle pile-up on a national highway in Amethi district early Tuesday, killing two people and injuring 18 others amid the ongoing cold wave across Uttar Pradesh, senior police officials said.

Amethi additional superintendent of police (ASP) Gyanendra Kumar Singh said the accident occurred around 2am near the Amethi-Sultanpur turn, close to an under-bridge in the Musafirkhana police station area limits, when visibility dropped sharply due to dense fog.

According to the police, a truck first rammed into the roadside railing and lost control, triggering a chain of collision as vehicles following close behind failed to stop in time. At least seven vehicles, including a Uttar Pradesh Roadwa...