Seven pupils on Monday morning succumbed after a classroom collapsed.
The morning tragedy happened at Precious Talent School in Ng’ando area along Ngong Road.
Rescue teams are at the scene of incident where several other children are said to be trapped under the rabble.
The incident took place at around 6.30 am.
57 victims have so far been taken to Kenyatta National Hospital for treatment as search and rescue efforts continue.
Present at the scene of incident were; area MP John Kiarie, PS Basic Education Belio Kipsang, government spokesman Cyrus Oguna.