Pop singer Justin Bieber has apologised to his fans after he cancelled the remainder of his Purpose world tour on Monday.

In a shock announcement yesterday, the star said he would not be finishing out the tour "due to unforseen circumstances" without giving a specific reason.

US showbiz website TMZ caught up with Bieber in Santa Monica where they asked him if he was doing alright.

He responded "everything's fine" but said that he's "been on tour for two years" and is looking forward to "just resting and getting some relaxation".

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The chart-topping singer went on to give this message to his loyal fanbase: "I love you guys, I think you guys are awesome.

"I'm sorry for anybody who feels, like, disappointed or betrayed, it's not in my heart or anything and have a blessed day."

Meanwhile, Bieber's manager also addressed the issue, taking to Instagram to apologise to fans and offer a reason for the axed shows.

He wrote: "To the fans from all over the world who took part over the last 16 months over 6 continents thank you. To Justin who gave it his all night after night thank you. And to those that won't be able to see it... 

"On behalf of myself, Justin, and the team, we are sorry. That was never our intent. But a man's soul and well being I truly care about came first and We must all respect and honor that. Justin will be back and I know he looks forward to performing for you and with you all again. One chapter ends and another begins."

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The Sorry hitmaker, who has been touring his 2015 hit album Purpose for the past 18 months, delighted Irish crowds when he played at Dublin's RDS venue last month.

Bieber has played more than 150 shows thus far in the tour, but will not play the final 14 scheduled performances.

No official reason has been given for the tour coming to an abrupt end, but a source told TMZ that Bieber was "just over it".

Another source told Variety that the chart-topper made the decision on his own. "It wasn’t a decision made overnight, the source told the US showbiz publication. "He’s had some time off and was able to consider his commitments."

Justin Bieber cancels Purpose tour "after careful consideration"

A statement on his website said: "Due to unforeseen circumstances, Justin Bieber will cancel the remainder of the Purpose World Tour concerts.

"Justin loves his fans and hates to disappoint them. He thanks his fans for the incredible experience of the Purpose World Tour over last 18 months.

"He is grateful and honoured to have shared that experience with his cast and crew for over 150 successful shows across 6 continents during this run.

"However, after careful consideration he has decided he will not be performing any further dates. Tickets will be refunded at point of purchase."

Justin Bieber will not play the final 15 dates on his world tour

Most of Bieber's remaining dates were in the US, but he was also due to play in Japan, Hong Kong, the Philippines, Singapore and Indonesia.

Bieber has not yet commented on the news on social media.

Fans have reacted to the news of the tour cancellation with sorrow and solidarity on Twitter.

Read our review of Bieber's RDS gig here.