A strike involving over 7,000 nurses at two New York City hospitals has ended after three days, as they reached tentative deals with hospitals over staffing levels, the New York State Nurses Association (NYSNA) said on Thursday.

Nurses at Montefiore Medical Center in the Bronx and Mount Sinai Hospital in Manhattan will go back to work Thursday morning after reaching an agreement for "enforceable safe staffing ratios", the NYSNA said in a statement.

"Through our unity and by putting it all on the line, we won enforceable safe staffing ratios at both Montefiore and Mount Sinai where nurses went on strike for patient care," said NYSNA President Nancy Hagans.

(Reporting by Jyoti Narayan in Bengaluru; Editing by Toby Chopra)