Mumbai, Nov 26 (ANI): Nation on Tuesday observed the fifth anniversary of the 26/11 Mumbai attack that shook the entire nation in 2008, as Pakistani gunmen stormed prime hotels and city landmarks killing 166 people and strained already tense relations between New Delhi and Islamabad. The Mumbai Police held a memorial service at the Gymkhana. Maharashtra Chief Minister Prithviraj Chavan and top Maharashtra police officers were present at the event to pay homage to the martyrs. Heaving a sigh of relief, residents praised Mumbai police for its vigilance and security in the city.