NEW YORK, NOV. 29 -- An American church volunteer said today that she was blindfolded, tortured and interrogated in Treasury Police headquarters in San Salvador while a U.S. vice consul "having coffee with the colonel in charge" did nothing to intervene. Josephine Beecher, 37, of Lopez Island, Wash., said at a news conference that she was arrested last week when Salvadoran national guardsmen raided a refugee sanctuary in St. John the Evangelist Episcopal Church in San Salvador where she worked. Another American was among six people, who were sheltering refugees at the church, who were arrested and released within a day, but at least 14 Salvadoran church workers remain in custody, church officials said. Before Beecher spoke, Presiding Bishop Edmond L. Browning of the Episcopal Church released a statement signed by the heads of nine churches representing 13 million Americans. It declared "our outrage over the deliberate and calculated campaign by government forces in El Salvador to intimidate and harass the churches in that country." The 10-year war between government and guerrillas has resulted in recurring violence against church leaders. Roman Catholic Archbishop Oscar Romero was gunned down in March 1980 while saying Mass in a chapel in San Salvador. Nine years ago, four American nuns were found shot and buried on a road near San Salvador. Two weeks ago, six Jesuit priests, their cook and her daughter were dragged from their beds at a university in San Salvador and killed by armed men suspected of being linked to the military. Salvadoran government officials have long expressed suspicion that church workers ministering to the poor are clandestinely supporting the rebel Farabundo Marti National Liberation Front (FMLN). In the wake of a rebel offensive that began Nov. 11 and spread today to wealthy suburbs of San Salvador, including homes of U.S. consular officials, Salvadoran police have raided Roman Catholic, Baptist and Lutheran church offices. Salvadoran police are still detaining Jennifer Jean Casolo, 28, a Connecticut native arrested last week after police dug up ammunition, explosives and grenades in the back yard of a house to which she moved recently. Casolo had worked for five years in El Salvador organizing visits of human rights and church workers for the ecumenical Christian Education Seminars. Beecher, who returned from El Salvador Tuesday night, said that Casolo and other religious workers recently received telephoned death threats and that as many as 40 foreign church workers have been forced to leave the country. Beecher said her interrogators accused her of being "a delinquent terrorist" and "of having planned the current offensive." "I have to say," she added, laughing, "I don't do that. That's a little beyond my capacity. I am in El Salvador to work with people who are committed to a peaceful alternative to the violence." Beecher said U.S. Vice Consul David Ramos watched as policemen removed her watch and glasses and led her away for questioning. "I was blindfolded, handcuffed, hit in the head and threatened," she said. "They said they were going to set the electric shock up and said, 'Let's turn on the electricity.' They ran some object . . . across my throat and said, 'This is what's going to happen to you.' " She said her interrogators also placed a rubber hood filled with talcum powder over her head to force her to answer questions. "The entire time I was being interrogated," she said, "the U.S. consular official was on the premises, having coffee with the colonel in charge." In order to be released, Beecher said, she was told that she had to sign papers that included a phrase saying she had not been mistreated psychologically or physically. When she signed the form but crossed out that clause, she said, Ramos ordered that another form be typed with the clause intact and told her to sign it. When she complained of her treatment to consular officials, she said, "I was told that what I had received was normal treatment for a prisoner of war and that they didn't see any problem with that." In Washington, State Department officials said that they take seriously allegations by American church workers of mistreatment and said Beecher's charges would be investigated. However, the officials said, they could not comment immediately because the guerrilla offensive today had disrupted communications and forced the department to concentrate exclusively on measures to protect Americans there. Staff writer John M. Goshko in Washington contributed to this report.