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All four now face criminal charges including possession of explosives, attempted murder, attempted murder of a policeman and causing explosions that damaged property. Prewpan said he believed there already was enough evidence to prosecute them.

The Israeli ambassador to Thailand, Itzhak Shoham, declined to comment on reports his staff had been specifically targeted. He said the Israeli Embassy was open and functioning as normal.

Shoham told The Associated Press earlier this week, however, that the similarity of the bombs found in Bangkok and New Delhi had led Israel to believe the plots were linked.

Prewpan also said that two homemade “sticky” bombs found at the blast site Tuesday matched the devices planted on Israeli diplomatic cars in India and Georgia a day earlier.

Thailand’s acknowledgment that terror attacks were being planned on its soil stood in contrast to its denials of that last month, when police arrested a Lebanese-Swedish man with alleged links to Hezbollah. At the time, authorities insisted Thailand was only being used as a staging ground for attacks, but was not the target. The man led police to a warehouse near Bangkok packed with more than 8,800 pounds (4,000 kilograms) of urea fertilizer and other materials that could be used to make bombs.

After that incident, Israel and the United States warned their citizens to be alert. The U.S. Embassy said foreign terrorists may have been looking to attack tourist areas in Bangkok and Thai media reported the attacks were aimed at Israeli targets, including the Israeli Embassy.

Thai officials say it is not clear if the two incidents are connected.

Associated Press writers Todd Pitman in Bangkok and Josef Federman in Jerusalem contributed to this report.