A$AP Rocky performing at Ottawa Bluesfest. Tuesday July 10,2012. (ERROL MCGIHON/QMI AGENCY).

Rising rapper A$AP Rocky was forced to postpone a sold-out concert in Toronto on Tuesday after his entourage was turned away by officials at the Canadian border.

The American hip-hop star was due to perform with newcomers Danny Brown and Schoolboy Q at the Sound Academy as part of his Long Live A$AP Tour, but the gig had to be axed at late notice due to "immigration issues".

Breaking the bad news to his Twitter.com followers, A$ap Rocky wrote, "Couldnt (sic) make it across the border I apologize to the fans we're rescheduling a new date".

It was the group's second attempt in just three days to cross the U.S./Canadian border - they were also denied entry last Sunday, according to Brown.

After that failed attempt, he tweeted, "Canada is mean... Looks like I will never be going to Canada".

The trio is expected to try their luck with border authorities once again on Oct. 20, when they are scheduled to play a show in Vancouver.