NEW YORK, June 20 (Reuters) - Two Madonna fans ended

their lawsuit in New York accusing the pop superstar of starting

concerts two hours late, prompting her legal team to threaten

the plaintiffs' lawyers with sanctions.

Michael Fellows and Jason Alvarez did not say in a Brooklyn

federal court filing on Wednesday why they voluntarily dismissed

their proposed class action against Madonna and tour promoter

Live Nation with prejudice, meaning it cannot be brought

again.

In a separate filing on Wednesday, the defendants' lawyer

said the dismissal "was not the result of any settlement."

Fellows and Alvarez alleged false advertising and negligent

misrepresentation after Madonna, 65, began three December

concerts on her "Celebration Tour" at Brooklyn's Barclays Center

after 10:30 p.m., though tickets promised an 8:30 p.m. start.

The plaintiffs said that because the concerts ended around 1

a.m. the next day, they had either to leave early or spend more

to get home because of limited public transport and ride-sharing

options, and see their plans for the next day disrupted.

Fellows and Alvarez, both of Brooklyn, said they would not

have bought their tickets had they known about the late starts.

They said Taylor Swift and Bruce Springsteen, both promoted

by Live Nation, start their concerts on time.

Jeff Warshafsky, the lawyer for Madonna and Live Nation, in

a June 10 court hearing accused the plaintiffs of waging a

harassment campaign aimed at "extorting" a big settlement.

In his filing on Wednesday, Warshafsky said the defendants

viewed the case as a "frivolous strike suit designed to force

them to incur legal expenses," and that they "reserve the right

to move for sanctions, attorneys' fees, and costs."

Lawyers for Fellows and Alvarez did not immediately respond

on Thursday to requests for comment.

A similar lawsuit by ticket purchasers against Madonna and

Live Nation remains pending in the Washington, D.C., federal

court over late-starting December concerts in that city's

Capital One Arena.

The case is Fellows et al v. Ciccone et al, U.S. District

Court, Eastern District of New York, 24-00357.