British police have arrested four men in connection with the bungled bombing attempts last week on London's transport system.  British media say one of those arrested is a Somali-born man who planted a bomb that failed to explode on a subway train. 

According to local news reports police are holding Yasin Hassan Omar, 24, who is accused of attempting to detonate a bomb last Thursday on the London subway's Victoria Line.

Police say four men were arrested in pre-dawn raids on two addresses in the central English city of Birmingham.

In one case, police say, they fired an electronic stun gun to subdue a suspect.  A suspicious package was found at the man's home and an army bomb disposal unit was called in, and more than 100 nearby residences were evacuated.

The suspect at that address was later transferred to a central London police station for further questioning.

Yasin Hassan Omar's photograph was released to the public last Friday as police intensified their manhunt for four suspects who authorities believe wanted to blow up three subway lines and a bus in suicide attacks.

He is believed to have been born in Somalia, but came to Britain as a child in 1992, according to the British Home Office.

Another identified suspect is Muktar Said Ibrahim, 25, a native of Eritrea who now holds British citizenship.  His photo also has been released by the police.  The identity of the other two wanted men has not been made public.

As the police investigation unfolded, Prime Minister Tony Blair held talks with his Spanish counterpart, Jose Luis Rodriguez Zapatero.

Afterward, Mr. Blair endorsed the Spaniard's proposal for what is called an "alliance of civilizations" to link Western and Muslim countries in the fight against terrorism.

Mr. Blair, who holds the rotating European Union presidency, says Europe also needs to do a better job of capturing and extraditing suspected terrorists.

"I am very anxious to make sure we cooperate fully with our European partners so that where there are people wanted for terrorist activities in other countries, then they get the fullest possible cooperation from us and our judicial system," he said.  "The basic principle of solidarity between European countries in fighting this terrorism is essential."

Britain has been on high alert for more terrorist attacks since July 7, when a team of four British Muslim suicide bombers attacked three subway trains and a bus, killing 52 passengers.