A 22-year-old man charged in three sexual assaults in Somerville and Medford is an illegal alien from El Salvador, the U.S. Immigration and Customs Enforcement has confirmed

ICE has placed a detainer on Alfredo Romero Posada, who was living in an apartment in Somerville, according to court records. After local charges are adjudicated, Posada will be turned over to ICE and placed in removal proceedings, an ICE official said. Posada was ordered held without bail after pleading not guilty to three counts of assault with intent to rape and indecent assault and battery on a person 14 or older. He faces a dangerousness hearing November 29, 2011 in Somerville District Court, the Middlesex District Attorney’s Office has said. Posada was picked out by the victims from a lineup of six men, according to police. Posada told authorities that he is being treated for schizophrenia. Police are investigating whether Posada is involved in other sexual assaults in the area.