CHARLESTON, S.C. - The FBI is investigating whether any civil rights were violated in separate incidents involving a school drug sweep and a shooting.

Federal agents are taking the lead in the investigation of a drug raid earlier this month at Stratford High School in Goose Creek, according to WCSC-TV in Charleston.

Police entered the school early in the morning on Nov. 5. The officers drew guns and restrained students with plastic handcuffs. No drugs were found in the raid.

The aggressiveness of the officers has brought scrutiny from several civil rights groups including the National Association for the Advancement of Colored People, which says black students were targeted in the search. State police and other outside agencies have been investigating the incident.

Federal agents also will review the case of Asberry Wylder, who was shot to death Nov. 7 by North Charleston police.

According to the family attorney, Wylder was a diagnosed schizophrenic who had a history of run-ins with police. Court records show he should have been in a mental health treatment program instead of on the streets.

Police say Wylder fought them when they tried to apprehend him for alleged shoplifting. Wylder was shot twice after he used a knife to stab an officer wearing a protective vest, police say. Witnesses say police beat Wylder and fired the second shot after he was handcuffed and on the ground.

The State Law Enforcement Division has been investigating the shooting, and North Charleston Mayor Keith Summey has asked the U.S. Justice Department for a separate investigation.

Federal officials say they will investigate both incidents and send reports to the Justice Department's civil rights division, which will decide whether there needs to be a major investigation.

The preliminary FBI investigation could take about a month.