Because they were Israeli commando's.
Mumbai terrorists had been staying at the Jewish Centre (Nariman House) in a guest house for 2 weeks prior to the attacks.
Via: CBC.ca
Two of the hostages killed were
identified as Rabbi Gavriel Holtzberg and his wife, Rivka, the couple
who ran the centre, said a spokesman for the Chabad-Lubavitch movement.
Their 18-month-old son had been one of three people rescued from the
centre on Thursday.
(Sacrificial lambs)
In a telephone interview with CBC News
from outside the centre, freelance journalist Arun Asthhana said there
are reports that some of the militants had stayed at a guest house
there for up to 15 days before the attacks.
"They had a huge mass of ammunition, arms and food there," Asthhana said.