Israeli forces have joined Kenyan troops in the effort to save hostages from al-Qaida-linked Somali terrorists at a Nairobi mall where gunmen killed at least 59 people on Saturday, AFP reported on Sunday."The Israelis have just entered and they are rescuing the hostages and the injured," AFP quoted a security source as saying.Kenyan Foreign Minister Ole Lenku said earlier Sunday that an unknown number of hostages remained in the mall, held by an estimated 10-15 gunmen.