The hip-hop stars are currently performing for fans on their joint Summer Sixteen Tour, and while they were onstage at the Talking Stick Resort Arena in Phoenix, Arizona on Tuesday night (06Sep16), thieves targeted their tour bus.

The culprits snatched a briefcase full of jewellery, estimated to be worth between $2 million (£1.5 million) and $3 million (£2.24 million), and managed to get away unnoticed, according to

Sources tell the website the stolen goods belonged to Ciara's ex-fiancee, but Drake was livid when he learned about the heist, and video footage of his reaction shows the Hotline Bling hitmaker lambasting security staff while waving his arms around in disbelief.

The theft has since been reported to police, who are said to be reviewing the venue's security footage to try and identify the suspects.

The Summer Sixteen Tour is expected to continue as planned in Los Angeles on Wednesday night (07Sep16), when the rap stars will perform the first of three dates at the Staples Center. Those shows are sure to be star-studded - the rappers welcomed Lil Wayne and UGK star Bun B to the stage for a concert in Houston, Texas on Sunday night (04Sep16), and Drake locked lips with his rumoured girlfriend Rihanna during a performance in Miami, Florida last week (ends02Sep16).

Representatives for Drake and Future have yet to comment on the jewellery heist news.