Hey all
This is my guess and hope it is very very right.
The woman who does pooja and gives prasad (everytime) to the minister with whom veer talks on phone and reports the incidents is the culprit and she is the one giving information to the terrorists and she may be unveiled in the coming episodes as the show producers are finding a new vampish face aka jignyasa of Kasamse and they have not still found so they are showing her shadows only when the mantri speaks on phone with veer sir.
One might also observe that she will always stand near him even after giving prasad and hear his telecon with Veer.
Whatever whatever, the woman's face will be revealed soon & poor Sameera will be proved innocent.
Amisha