Another day, another issue for Justin Bieber.

After arriving yesterday in LAX after spending time in Japan, the crooner was detained by airport security for four hours, according to reports.

Hollywood Life reports that the Biebs and his entourage arrived back in the US at 1 p.m.; however his entourage, baggage, and car were still there at 4 p.m. The "Boyfriend" singer was released by TSA after four hours of questioning.