"We haven't received the order copy. After reading the order copy, we will decide whether we will approach the higher court in the matter," said a senior officer from Special Cell.
Officials say that in cases like these, it is difficult to prove the guilt of the accused.
The serial blasts at three places - Sarojini Nagar, Paharganj and Kalkaji- on 29 October 2005 had claimed 67 lives and injured over 225 persons.
However, he held the third accused, Tariq Ahmed Dar, guilty of being a member of a terror outfit and giving support to it, but let him off too, saying he has already undergone more than 10 years in jail, which is the maximum punishment prescribed under the law for these offences.
The court also said the prosecution had failed to prove the guilt of those who were acquitted.