Kardashian's Dash Store Hit By Arsonist

The Kardashians' Dash store was the target of an arsonist who threw a burning rag through the window of the store late Monday night ... TMZ has learned.

Law enforcement tells TMZ ... witnesses saw a man throw a weighted, burning rag through the West Hollywood storefront window just after 11:15 PM.

The rag burned itself out inside the store without incident.

Cops found a bottle of lighter fluid outside the store. They're hunting for the suspect.