Joseph Mwangi, 34, sits in a state of shock after discovering the charred remains of two of his children, one aged 6, and the other of unknown age, at the scene of a fuel explosion in Nairobi, Kenya, Monday, Sept. 12, 2011. (Ben Curtis/AP)

Local officials said after a large crowd had gathered to recover fuel leaking from the pipe, a cigarette was tossed into the sewer that ignited the gasoline.

As the Washington Post’s Sudarsan Raghavan reports from Nairobi, the death toll is uncertain. The provincial commissioner reports more than 60 dead but the number likely to rise.

A person injured in the gasoline pipeline incident is brought to Kenyatta National Hospital in Nairobi, Kenya, Monday, Sept. 12, 2011. (Khalil Senosi/AP)

Firefighters are still working to control the fire. Watch video of their efforts below, via the Telegraph:

Read the Post’s full story here.