Can a property owner sell a home to another buyer while in escrow dispute with original buyer?

Entered into escrow home has renter. notice to perform issued on loan contingency and agents had phone call regarding solution to the renter vacating property. While buyer's agents were waiting for a response that the seller's agents said they would get, the seller issued notice of cancellation. Buyer lifted all contingencies. it has been a week and seller's agent will not communicate with buyer.