New York City’s Health Department has identified a new cluster of Covid-19 cases in Brooklyn, and said a marked uptick in infections there and in some other neighborhoods is “cause for significant concern.”

Four areas have seen a large increase in cases between early August and last week, Patrick Gallahue, a spokesman for the city’s Department of Health and Mental Hygiene, wrote in an email to reporters.

After becoming the global epicentre of the coronavirus pandemic in the spring, the city has managed to bring the number of positive test results to below 1 per cent through social distancing measures, Reuters reported.

“It is now clear that these signals in the south of Brooklyn have coalesced into one cluster we are calling the Ocean Parkway Cluster,” Gallahue wrote in the email. “At this point in time, these increases could potentially evolve into more widespread community transmission and spread to other neighborhoods unless action is taken.”