fishy flop check

[hobbsmann]

Villain is unknown and I just sat down at the table recently. These flop checks after steal raises are always so suspicious and as a result I'm lost on the best turn line. bet/fold? check/folding seems too weak along with check/calling.

Party Poker 10.00/20.00 Hold'em <font color="#0000FF">(6 handed)</font> link

Preflop: Hero is BB with K[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/heart.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Button raises</font>, <font color="#666666">1 folds</font>, Hero calls.

Flop: (4.50 SB) 7[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, Button checks.

Turn: (2.25 BB) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero.