(CNN) A huge explosion ripped through the diplomatic quarter of Kabul Wednesday, killing dozens of people and blowing windows out of nearby buildings in one of the deadliest attacks in the Afghan capital in years.

The Taliban -- the most influential terrorist group in Afghanistan -- have denied any involvement in the attack, which has turned the spotlight back on the country's 16-year war. Here's what you need to know.

Why is this attack so significant?

The bombing is significant because of its scale and location, but also its timing.

Firstly, the blast hit rush hour traffic, signaling that its intent was pure terrorism.

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