"From his body language, we could make out that he was very nervous. However, he remained quiet before he was taken out from his cell for the hanging," the official said.
Kasab had also offered prayers and asked if his family was informed in advance about the hanging to which jail authorities replied in the affirmative, the official said.
Nearly four years after the Mumbai terror attack, Kasab, the sole surviving Pakistani gunman, was hanged this morning at Yerawada central prison in Pune in a top secret operation.
Ten terrorists belonging to Pakistan-based terror outfit Lashkar-e-Taiba (LeT) had come to Mumbai and carried out the arttacks in which 166 people were killed.
Nine of them were killed during the 60-hour siege which began on the night of November 26, 2008. Kasab, however, was caught alive.