Benjamin Mueller

Four days after the sexual assault of an 18-year-old woman at a Brooklyn playground, investigators have been interviewing two of the suspects, holding two others and seeking a fifth suspect, all in an effort to piece together what happened that night.

Four teenagers suspected of taking turns raping an 18-year-old woman at gunpoint at a Brooklyn playground after ordering her father to leave her side were taken into custody on Sunday, the police said.

Syed Rizwan Farook and his wife, Tashfeen Malik, left their 6-month-old daughter with Mr. Farook’s mother, telling her they were dipping out for a doctor’s appointment, a relative said. By nightfall, it was clear that was a ruse.

Authorities say two teenage boys were called into a sanctuary and savagely beaten by at least a half dozen people, including their parents and older sister.

Richard W. Matt, one of the convicted murderers who staged an elaborate escape from New York’s largest prison nearly three weeks ago, was killed on Friday in a burst of gunfire by federal agents, two people with knowledge of the situation said.