NAIROBI: Heavy and rapid bursts of gunfire were heard coming from inside Nairobi's Westgate shopping mall at dawn on Monday, an AFP reporter at the scene said.
A Kenyan security source confirmed that an assault against al-Qaida-linked Somali gunmen inside the complex was underway.
The AFP correspondent said he heard about 15 minutes of fierce gunfire which then subsided. An AFP photographer at the scene said troops posted around the mall ducked for cover.
The photographer said it was "sounded as if the shots were coming from somewhere around the mall, or were being fired from a vantage point in the mall."
The Kenyan army had said it had isolated the Islamist attackers, who stormed the complex at midday on Saturday, killing at least 68 people and taking hostages.
Shebab rebels said its fighters had carried out the attack in retaliation for Kenya's military intervention in Somalia, where African Union troops are battling the Islamist.
Earlier, security and intelligence sources told AFP that Israeli agents were also assisting in the operation. Kenya's National Disaster Operation Centre said a "major engagement" with the al-Qaida-linked al-Shabaab fighters was in process.
"Our concern is to rescue all hostages alive and that is why the operation is delicate," the Kenya defence forces said in its latest update. It did not say how many people were being held by the dozen-or-so attackers.
"All efforts are underway to bring this matter to a speedy conclusion," it said, adding four of its soldiers were wounded in what appeared to be the final efforts to secure the mall, which is popular with wealthy Kenyans and expatriates.
"The criminals are now all located in one place within the building," Kenyan President Uhuru Kenyatta said in a speech to the nation.
"They shall not get away with their despicable and beastly acts," Kenyatta said in an emotional speech, in which he announced he had lost a nephew and his nephew's fiancee in the attack. "We will punish the masterminds swiftly, and indeed very painfully."
Kenyatta said more than 1,000 people were rescued, and that he had also received "numerous offers of assistance from friendly countries".
A Kenyan security source said Israelis "are rescuing the hostages and the injured". The Israeli foreign ministry refused to confirm or deny its agents were involved, although a Western intelligence official confirmed the Israelis were playing a frontline role.
British and US agents were also at the scene, the source said.
Terrified witnesses told of scenes of horror and panic as the masked gunmen tossed grenades and sprayed automatic gunfire in the packed centre around midday on Saturday, sending panicked shoppers and staff fleeing or diving for cover.
Officials estimated some 200 people have been wounded, and the Red Cross made a nationwide appeal for blood donors.
Police sources who had entered the building on Sunday evening said they feared that death toll, now confirmed at 68, "could be much, much higher ... judging from the bodies sighted inside."
Somalia's al-Shabaab rebels said the carnage was in retaliation for Kenya's military intervention in Somalia, where African Union troops are battling the Islamists.
"If you want Kenya in peace, it will not happen as long as your boys are in our lands," al-Shabaab spokesman Sheik Ali Mohamud Rage said in a statement.
The group also issued a string of statements via Twitter, one of them claiming that Muslims in the centre had been "escorted out by the Mujahideen before beginning the attack".
Witnesses have confirmed that the gunmen were trying to weed out non-Muslims for execution by interrogating people on their faith.
The dead also included three Britons, two French women, two Canadians including a diplomat, a Chinese woman, a South Korean, a South African and a Dutch woman, according to their governments. Also killed was Ghanaian poet and former UN envoy Kofi Awoonor, 78, while his son was injured.
Mall worker Zipporah Wanjiru, who emerged from the ordeal alive but in a state of shock, said she hid under a table with five other colleagues.
"They were shooting indiscriminately, it was like a movie seeing people sprayed with bullets like that," she said, bursting into tears. "I have never witnessed this in my life."
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