Police have removed country singer Bryan Martin from the stage by force after the We Ride singer behaved erratically during a performance in New York State.

According to local radio station Townsquare Media, Martin struggled during his live set, with his his behaviour sparking speculation that he was performing while intoxicated.

"He was completely wasted, performed the same hit he has 4x," one onlooker wrote online, according to the report.

"Proceeded to talk about his life. Hot drunk mess. Then assaulted the cops when they tried getting him off stage."

A fan-shot video shows Martin struggling with several officers at the side of the stage before they ultimately subdue him, lift him up over their heads and carry him away.

Martin took to social media on Saturday to apologise to fans about the incident, writing, "Sorry I let y'all down tonight. Truth is, I'm not OK. Been hitting it hard for a while and haven't took time to be honest with myself about my mental health, and it's nothing new to struggle with my anxiety and depression."

The singer added that despite this setback, "it's been the most consistent streak I've seen in years. Day one of another one starts today. God's got more in store, and he's restoring my strength as we speak."