interesting spot on the turn

[Octopus]

UTG+1 is a calling station, MP is a TAG, no read on CO.

9 handed

Hero has A8s in UTG and limps, UTG+1 calls, MP raises, CO coldcalls, blinds fold, all call.

Four to the flop for 9.5SB. Flop is Axx rainbow. Hero bets, UTG+1 calls, MP raises, CO coldcalls, all call.

Four to the turn for 8.5BB. Turn is a J putting a two flush on, not hero's suit. Hero checks, UTG+1 checks, MP checks (!), CO bets, Hero ...

Minor question: Do you call or raise here? (EDIT: or fold?)

Hero chooses to just call, UTG+1 calls, MP now raises (!!), CO calls, Hero ...

MAJOR QUESTION: Fold now or take a look at the river?