The incident took place in Dallupura village near Mayur Vihar Phase-III around 10 am.
Six children, aged below ten years, were playing in the vacant plot owned by one Vijender when the incident took place.
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"Five persons were killed in the incident. One person is critically injured," the officials said.
Officials said construction of a 10-feet boundary wall was being carried out in the plot. "The wall collapsed adjacent to Hindon drainage," they said.