Kenyans are marking the first anniversary of a deadly attack on an upscale shopping mall in Nairobi that sparked a siege and created new uncertainty over the reach of extremist violence in Africa. The attackers were identified as Islamist militants from Somalia, but few other details about the incident have emerged.

While mourning the dozens of people killed in the attack one year ago, many Kenyans were also angered by what was seen as a slow and poorly planned response to the violence. Revelations that security forces had stolen merchandise from inside the mall fueled the outrage.

Today, candles were lit and flowers were placed at a site outside the Westgate Mall, the scene of last September's attacks.

From Nairobi, NPR's Gregory Warner reports on today's remembrances:

"Prayer circles convened in grocery stores, bank lobbies, and cemeteries. An official memorial was unveiled with a choir, while homemade shrines sprung up around the city. Survivors and poets recounted the horror of that Saturday afternoon when at least 67 people were gunned down by militants from Al Shabab."But on social media, Kenyans raised still-unanswered questions about what exactly happened that day: How the siege was carried out, and why it dragged on for four days, giving Kenyan army officers inside the mall, who were supposed to be hunting the terrorists, ample time to loot nearly every store."The looters were caught on video but no senior officer was sacked. A special probe promised by the president after the attack has yet failed to produce any report."

Bloomberg Businessweek reports that Kenya's critical tourism industry is suffering.

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