July 10 (Bloomberg) -- A jury failed to reach a verdict in the case of two men accused of taking part in a botched suicide attack on London's public transport system on July 21, 2005, two weeks after bombers murdered 52 commuters during the morning rush hour.

Justice Adrian Fulford discharged the jury after they said they couldn't agree on allegations against Manfo Kwako Asiedu and Adel Yahya over a plot to attack three trains and a bus, a spokeswoman for the court said by telephone today. The jury yesterday convicted four other defendants of conspiracy to murder.

Prosecutors will say at a hearing scheduled for tomorrow whether they will seek a retrial for Asiedu and Yahya. Justice Fulford told the jury yesterday that he would accept verdicts against the two men if 10 of the 12 jurors agree.

The July 21 attack came as Londoners were recovering from the deadliest attacks on the city since World War II and the first suicide bombings in Western Europe. On July 7, 2005, four other Muslims had blown themselves up, killing commuters in attacks also aimed at three trains and a bus.

The four defendants convicted in the case yesterday -- Muktar Said Ibrahim, Yassin Hassin Omar, Hussein Osman and Ramzi Mohammed -- claim it was a hoax designed as a protest against the war in Iraq. The prosecution said the men had incompetently mixed the chemicals used in their bombs and had planned to kill hundreds of people.

The attempted attacks were carried out on a bus in Hackney and on trains at Warren Street, Shepherd's Bush and Oval underground stations.

Lost His Nerve

Asiedu, who didn't set off a bomb, said he went along with the gang's plans because he was frightened of them. He claims he never intended to kill and deliberately defused a bomb to save lives. The prosecution says he intended to become a suicide bomber and lost his nerve on the morning of the attack.

Yahya, who was out of the country at the time of the attack, claimed he had nothing to do with the plot. The prosecution alleged he planned the whole thing.

The trial was conducted at Woolwich Crown Court, a specially designed high-security courthouse adjacent to Belmarsh jail where the men are being held. The nine women and three men of the jury had been listening to evidence since the beginning of the year and deliberating since June 28.

To contact the reporter on this story: James Lumley in London at jlumley1@bloomberg.net;

Last Updated: July 10, 2007 07:27 EDT