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By Jon Schuppe

Two men suspected in brutal murders were added to the FBI's most wanted list on Thursday.

One, Luis Macedo, was the leader of a small crew of Latin Kings that attacked 15-year-old Alex Arellano on a Chicago street on May 1, 2009, according to the FBI.

After he refused to show a gang sign, Arellano was beaten with bats, chased into an abandoned building, shot and then set on fire, authorities say.

Authorities later said Arellano was not in a gang and was in the neighborhood to visit a girlfriend.

Luis Macedo, left, and Philip Patrick Policarpio have been added to the FBI's 10 Most Wanted list.FBI

Four of Macedo's accomplices have been sentenced to prison for the attack. Macedo, 28, who goes by the nickname "Ye-Ye" and lived in the Chicago suburb of Oak Lawn, remains on the run from a first-degree murder charge.

Authorities say he may have fled to Florida or Mexico. He also has family in Wisconsin and Indiana.

The second fugitive, Philip Patrick Policarpio, has been charged in the murder of his pregnant girlfriend in Los Angeles on April 12. He was on parole at the time of the attack, according to the FBI.

Authorities say Policarpio killed the girlfriend, Lauren Olguin, who was 17 weeks pregnant, during an argument at a party — first beating her with his hands, then shooting her in the head.

Policarpio, 39, who also goes by "Bugsy" and "Sinister," may have fled to the Philippines, where he has family, or to Las Vegas, the FBI said.

"His pattern is one of violence, and he is always armed. He is the definition of a continuing threat to the community," FBI Special Agent Scott Garriola said in a statement.

The FBI said it is offering up to $100,000 for information that leads to either man's arrest.