Jordan's military prosecutor indicted Abu Musab Zarqawi, one of the most wanted insurgents in Iraq, and 12 other alleged Muslim militants Sunday for an alleged al Qaeda-linked plot to attack the U.S. Embassy in Amman and Jordanian government targets with chemical and conventional weapons, government officials said.

The foiled plot was first revealed by Jordan in April.

The prosecutor, Lt. Col. Mahmoud Obeidat, summoned the nine suspects who are in custody and read them the charges, officials said on condition of anonymity. The four other suspects, including Zarqawi, are at large and will be tried in absentia, the officials said. They expect the trial to begin next month.

Security officials have said the militants were plotting to attack the offices of Jordan's prime minister, the secret service agency, the U.S. Embassy and other sites. In televised confessions, some of the suspects have said the plot was linked to Osama bin Laden's al Qaeda network.

Azmi Jayousi, the alleged head of the cell who was captured in April, said in a confession that the group was planning a chemical attack, according to Jordanian officials.

In an audio recording posted on the Internet in May, a man who identified himself as Zarqawi said his group was behind the plot in Jordan but denied it involved chemical weapons.

U.S. officials have offered a $25 million reward for Zarqawi's capture. He is suspected in about a dozen high-profile attacks in Iraq, including last year's bombing of the U.N. headquarters in Baghdad.

Abu Musab Zarqawi is believed to be behind many attacks in Iraq.Azmi Jayousi, the alleged head of a terror cell, was arrested in April.