Fears that a gang feud could escalate further prompted the closure of two high schools Friday and the postponement of a homecoming dance.

The Rev. Leon Kelly, a gang outreach leader, attended Friday’s funeral for Reysean Abram, a 13-year-old boy killed in a suspected gang-related shooting outside a house party a week ago. Mayor Michael Hancock and scores of friends and relatives also filled the pews at Friendship Baptist Church of Christ Jesus.

“There is tension from both sides right now, the Bloods and the Crips,” Kelly said during the 11 a.m. funeral. “The gangs are still alive and well. … It goes back and forth, back and forth.”

East High and Manual High released students near midday after what Denver police described as a “credible threat” at the schools. Police spokesman John White would not elaborate on the nature of the threats except to say that the one at East was made against the school in general, not a particular individual. Manual also postponed its Saturday night homecoming dance, citing “safety concerns.”

White said police had made no connection between the threats and Reysean’s killing, but three sources told The Denver Post that threats of retaliation had surfaced and police were concerned for students at both schools. Students were told not to loiter near the schools and some were escorted to their cars.

As a precaution, police have gone to other schools, including Montbello High, over the past week. Reysean had just started his first week at the school, his family said.

White declined to say whether police planned to step up enforcement efforts this weekend.

Also at 11 a.m. Friday, three miles to the south, at Park Hill Seventh-Day Adventist Church, mourners gathered to grieve the loss of 26-year-old Harry P. Morgan, a reputed member of the Bloods street gang. Morgan was shot to death Aug. 23 in the 1500 block of Uinta Street. Denver police have offered little information about that case.

People who were at the Montbello house party Aug. 30 said at least one gunman fired shots from a passing vehicle after an exchange of words among rival gang members. Reysean was riding his bike in the 4700 block of North Enid Way when he was struck. Those close to him said he associated with Crips, although his relatives said he was not in a gang.

Even after the arrests of Marquise Lewis, 20, and two juveniles in the deadly shooting, threats of violence continued on Facebook, sources said.

“It’s getting on my last nerve,” Kelly said of the Facebook posts. “A lot of these kids take what they’re reading as gospel.”

Police officials have offered no clues into what prompted the killing, and court documents filed against Lewis have been sealed.

Photos on Reysean’s Facebook page show him flashing gang signs, and a commenter on a page advertising a memorial for him this week warned attendees to leave their “flags” at home, referencing the colorful bandanas or rags that gang members sometimes wear around their necks or belt loops.

But Kelly, who said he consoled the Abram family when Reysean’s older brother was hit in a drive-by shooting about 10 years ago, said the tension was absent from his crowded funeral service.

“If this kid would have had this kind of support in life, he would be here today,” Kelly said later Friday. “Yeah, the kid had a lot of talent, but he had influences as well.”

Denver Post staffer Barbara Ellis contributed to this report.