According to Sonko, who represents the Westlands constituency where Westgate is located, two women approached him about three months ago with information that al-Shabaab militants had rented a house in the Parklands neighbourhood of Nairobi and were plotting such attacks.
"They told me the attacks were targeting Westgate, Village Market, the Kenyatta International Conference Centre and parliament," he told Sabahi. "I assisted them in recording a statement with the police and intelligence officers so a further probe could be carried out."
The National Security Intelligence Service and other security organs failed to act on the tip, Sonko said. He shared this information with the Senate on September 24th, the day the standoff at Westgate ended.
Fellow lawmaker Asman Kamama, who chairs the National Assembly's Administration and National Security Committee, said the mall attack exposed lapses in intelligence gathering.
"The way the attacks were carried out, it was well co-ordinated, meaning it was something that was well planned and executed," Kamama, a United Republican Party member who represents Baringo County, told Sabahi.
"And for our intelligence to have had no clue on the impending attacks, means there [were] huge security failures that we must audit and [for which we must] hold individuals culpable," he said.
The attack on Westgate not only stunned the nation but appeared to catch defenders of the homeland off guard, officials told Sabahi.
"In all honesty, this was the first time Kenya has witnessed such an audacious terrorist attack on a mall using guns," said Director of Police Reforms Jonathan Kosgei. "We knew of bombs, [but] this new style was hard to predict. However, the security forces did their best to contain the situation in the prevailing disadvantaged circumstances."