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Ms. Jones said about a dozen Indonesians were trained by LeT between 2000 and 2003, but it was not clear whether LeT had any role in planning the Indonesia plot. “I think Mumbai was probably just an inspiration,” she said.

Indonesia’s police chief, Gen. Bambang Hendarso Danuri, said the attackers had planned to focus their assault on the independence day ceremony at which Mr. Yudhoyono and other Indonesian and foreign dignitaries would have been present. “Killing all the state officials would have accelerated the transition from a democracy to a state controlled by Islamic Shariah law,” he told reporters.

“Their plan was also to launch attacks in Jakarta against foreigners — especially Americans — and attack and control hotels within certain communities, imitating what happened in Mumbai,” Gen. Danuri said.

A report by the International Crisis Group said the discovery of the jihadi training camp in Aceh revealed “a major mutation in Indonesian jihadi ranks. … It had chosen Aceh as a base, despite the antipathy of Acehnese to radical Islam.”

Mr. Obama, who spent part of his childhood in Jakarta, was expected to visit Indonesia in March but delayed his trip until mid-June so he could oversee the passage of the health care bill in Congress.