There was however, no loss of life, District Magistrate Raj Shekhar said.
Giving details, SP Rajesh Pandey said the incident occurred when metro workers were reinforcing the portion between the two pillars in Alambaugh area here.
He said though few workers were injured, no death was reported.
Shekhar said 8 workers were at the spot and all of them had been taken out and rushed to hospital for treatment of injuries.
To a question, he said no one was trapped in the debris.
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"The incident took place at around 7 AM when a slab of 10X2 metres which was being cast near Alambaugh bus station fell down," the district magistrate said.
One person has been admitted to King George's Medical University Hospital, Shekhar said.
(REOPENS DES20)
Meanwhile, a Lucknow Metro Rail Corporation (LMRC)
spokesman said, "Concreting work for the cross arm was going on at the site since midnight and it was about to be completed when the incident took place. The site has been cleared and the traffic has resumed."
Asked about the incident, Chief Minister Akhilesh Yadav said, "All safety precautions will be taken. I will inquire about incident, issue directions to ensure safety of labourers. Those injured will be given free treatment.