The city says the national opioid crisis is responsible for a major spike in overdose incidents at homeless shelters across the five boroughs.

That's according to a new Preliminary Mayor’s Management Report that examined the first four months of fiscal year 2018, which started July 1st of last year. 

Overdoses jumped nearly 600% to 81 incidents, compared to just 12 incidents in the same period during fiscal year 2017. 

The increase comes as the Department of Homeless Services implements a new automated process to report critical incidents in shelters.