We 're not done yet . That was the message terrorists of Al-Shabaab gave to Kenya on Wednesday , as officials still sorted through rubble and clues left in the wake of the recent massacre that took 67 lives at a Nairobi shopping mall . Read more : How does Al-Shabaab get its money ? The Somali militant group handed the threatening statement to regional media , which passed it on to CNN . For four days , starting on September 21 , Al-Shabaab fighters spread gunfire and flames through Nairobi 's Westgate Shopping Mall , leaving it partially destroyed , stained in blood and littered with bodies . CNN 's Zain Verjee : I ca n't get image of Westgate bodies out of my mind . Members of Kenya 's government were mute about what they had seen inside after emerging from an inspection there earlier this week . CNN learned that the Westgate mall attackers tortured some of the hostages . Military doctors said militants severed hands , cut off noses and , in some cases , hanged hostages . CNN has seen photographic evidence of one dead victim with a hand amputated . In the coming days and weeks , members of Parliament are expected to grill intelligence officials to find out more about how the attack occurred . Forewarned ? A number of Kenya 's Cabinet members and defense officials were warned about the possibility that Al-Shabaab was planning to carry out such an attack a year before gunman stormed the Nairobi mall , according to several police and intelligence sources . The warnings were made by the country 's National Intelligence Service as part of regular situational reports given to Cabinet members , the inspector general of police , members of the National Security Advisory Council and military intelligence officials . CNN has seen an electronic version of those reports , which contain an extensive list of terror threats from several regions across Kenya over an extended period , but they also specify Al-Shabaab posed a threat to several targets , including Westgate Shopping Mall . The news about the intelligence warnings comes amid revelations that the mall favored by Westerners and tourists was long considered a possible terror target . Kenyans debate : Time to get troops out to Somalia ? Al-Shabaab made statements claiming responsibility , including saying on Twitter that it sent the gunmen in retaliation for Kenya 's involvement in an African Union military effort against the group , which is al Qaeda 's proxy in Somalia . Kenyan forces killed five terrorists , and 11 others are in custody over possible links to the attacks , President Uhuru Kenyatta has said . But an immense amount of work remains to learn how Al-Shabaab was able to pull off such a well-coordinated and brazen attack . The terror group was thought to be badly bruised by recent losses in its Somalian homeland . Kenyan military intervention . Last year , the Kenyan military was part of a peacekeeping force that defeated Al-Shabaab forces to liberate the key Somali port of Kismayo . Since Kenya launched attacks against Al-Shabaab in Somalia in 2011 , the group has hurled grenades at Kenyan churches , bus stops and other public places . The mall attack was the deadliest terror attack in Kenya since al Qaeda blew up the U.S. Embassy there in 1998 , killing 213 people . Terrorism experts say the attack bears eerie similarities to the 2008 siege of a hotel in Mumbai , India , another upscale target with Western appeal . Lashkar-e-Tayyiba , a Pakistani terrorist group , held the hotel for more than three days , killing 166 people .
The Somali terrorism group Al-Shabaab issued a threatening statement to Kenya four days . al-Shabaab fighters held the mall for Wednesday . Somali forces say they killed five terrorists and took at least 11 into custody .