Usher, Scooter Mum On Biebs

1/28/2014 1:05 PM PST

Usher and Scooter Braun Mum On Justin Bieber


Usher and Scooter Braun had nothing to say as they arrived back on U.S. soil after spending time with Justin Bieber.

Several photogs peppered both -- especially Usher -- with questions about what is loosely being described as an "intervention."

Not a word from either.

Based on what we know ... Bieber's not down with either rehab or therapy.