Charles County authorities said a poolside scuffle led to a slashing and a shooting last week in an escalating series of reprisals that has left residents of a Waldorf community worried about their safety.

Marcus Milstead, 26, was arrested Wednesday in connection with two assaults. His brother Michael Milstead, 25, has been charged in the assaults and in a related shooting but was still at large Friday night.

In charging documents filed in Charles County District Court, authorities allege that on July 9 the Milsteads, both of Prince George's County, tried to throw Antoine D. Savoy, 24, into the pool at the Huntington Recreation Center in Waldorf.

When Savoy resisted, Marcus Milstead held his arms while Michael Milstead punched him in the face, knocking him to the ground, authorities allege.

The incident flared later that day when Savoy was walking to his car. He ran into the brothers, and Marcus Milstead punched him in the face, court documents say.

Two days later, on Monday, Marcus Milstead was attacked while walking in the 2600 block of Rooks Head Place in Waldorf.

A report by the Charles County Sheriff's Office said Milstead was slashed with a knife by attackers who fled before they could be identified.

Milstead was flown to Prince George's Hospital Center for treatment.

That night, residents of the Wakefield Circle and Rooks Head Place community, which is run by Maredith Management, sent an unsigned fax to news outlets.

"We live in what we thought was a safe community. . . . Tonight we had a stabbing right in front of our homes and our children," it said. "We are worried for our children's safety."

Vincent T. Oliva, president and chief executive of Maredith Management, said he received a complaint about the attacks.

"We have requested the Charles County Sheriff's Dept. increase patrols in the area," he wrote in an e-mail. "There are also funds allocated in the Neighborhood budget for security to be performed by off duty Charles County Sheriff's officers."

The next day, Tuesday, around 10:30 p.m., occupants of a green Cadillac opened fire on Savoy's home in the 4800 block of Underwood Court in Waldorf, the Sheriff's Office reported.

Authorities got warrants for the Milsteads on Wednesday. At 4:19 p.m. they found Marcus Milstead driving in the neighborhood, and he was arrested, according to the Sheriff's Office report.

Each brother has been charged with two counts of first-degree assault, two counts of second-degree assault and conspiracy to commit first- and second-degree assault.

Michael Milstead also was charged with reckless endangerment, the sheriff's report said.