Three men have been arrested in Northwest Washington, and D.C. police said yesterday that they are suspects in recent armed robberies of residents in Chevy Chase and Bethesda.

Six robberies carried out in the Maryland suburbs during the last two weeks appear to be part of a series of about 30 similar robberies that have taken place in Northwest Washington and in Montgomery and Prince George's counties since late January, officials said yesterday.

Several elderly residents were beaten during the recent robberies, each of which witnesses and police said was carried out by two persons.

Deputy D.C. Police Chief Alfonso Gibson said at a press conference yesterday that he is "very sure" that the men arrested late Tuesday and early yesterday were the persons who were involved in the Chevy Chase robberies.

Police said Dennis Curtis Brown, 28, of 5600 Nicholson St., Riverdale, and Craig Kenneth Clary, 24, of 2026 13th St. NW, were arrested about 8:30 p.m. Tuesday. Both were charged with narcotics violations.

Donald Leroy Brown, 32, of 2015 Perry St. NE, was arrested about 4 a.m. yesterday and charged as a fugitive from Montgomery County on earlier assault charges, police said.

The Browns, who are brothers, and Clary were arraigned in D.C. Superior Court yesterday on fugitive warrants from Prince George's County where they face armed robbery charges, police and court officials said.

The men waived extradition, according to court papers.

It was unclear last night if the Prince George's County arrest warrants are connected with the recent series of robberies.

A Montgomery County police spokesman said that two of the three men have been charged in warrants in that county in connection with two robberies since January, but would provide no more information.

Police sources said a break in their investigation of the incidents came last Friday when a ring from a recent residential robbery was discovered in a pawn shop.

On Tuesday, police said, officers saw the man who had pawned the ring enter a coin-trading firm in Washington and sell coins believed taken in one of the recent robberies.

A team of about 30 officers from the three jurisdictions worked since late last week to make the arrests, sources said.