BEIJING, May 12 (Xinhuanet) -- A Polish social worker who helped save some 2,500 Jewish children from the Nazis by smuggling them out of the Warsaw Ghetto and giving them false identities -- has died. She was 98.

    Irena Sendler died at a Warsaw hospital on Monday morning, her daughter, Janina Zgrzembska, told The Associated Press. She had been hospitalized since last month with pneumonia.

    Born in Warsaw, Sendler served as a social worker with the city's welfare department, masterminding the risky rescue operations of Jewish children from the Warsaw Ghetto during Nazi Germany's brutal World War II occupation.

    Records show that Sendler's team of some 20 people saved nearly 2,500 children from the Warsaw Ghetto between October 1940 and April 1943, when the Nazis burned the ghetto, shooting the residents or sending them to death camps.

    Under the pretext of inspecting the ghetto's sanitary conditions during a typhoid outbreak, Sendler and her assistants went inside in search of children who could be smuggled out and given a chance of survival by living as Catholics.

    Babies and small children were smuggled out in ambulances and in trams, sometimes wrapped up as packages. Teenagers escaped by joining teams of workers forced to labor outside the ghetto. They were placed in families, orphanages, hospitals or convents.

    In hopes of one day uniting the children with their families -- most of whom perished in the Nazis' death camps -- Sendler wrote the children's real names on slips of paper that she kept at home.

    When German police came to arrest her in 1943, an assistant managed to hide the slips, which Sendler later buried in a jar under an apple tree in an associate's yard. Some 2,500 names were recorded.

    After World War II, Sendler worked as a social welfare official and director of vocational schools, continuing to assist some of the children she rescued.

    (Agencies)