Stunned, injured shoppers escape Kenyan mall

Armed police are searching for gunmen inside this shopping mall in the Kenyan capital, Nairobi.<br/> <br />At least 20 people were killed here on Saturday after gunmen opened fire.<br/> <br />Sporadic gunfire continued at least two hours after the attack began.<br/> <br />Earlier, scores of shoppers were led to safety by police, some in shock, others injured.<br/> <br />The local Red Cross says more casualties are inside the Westgate shopping complex.<br/> <br />Witnesses say they heard grenade blasts.<br/> <br />Others say they saw several armed assailants storm the shopping mall.<br/> <br />It looked like an attack, they say, not a robbery.<br/> <br />The militant group al Shabaab in neighboring Somalia - which is linked to al Qaeda -- has threatened in the past to strike this very mall.<br/> <br />It's popular with Nairobi's ex-pat community, and it would have been packed with shoppers on a Saturday morning.<br/> <br />But there was no immediate reaction from al Shabaab and no official statement, either, from police about the attac