His freedom had been a stipulation for the hostages being freed, the BBC's Frank Gardner said.
The BBC's security correspondent Frank Gardner said the group was closely linked to al-Qaeda's franchise in north-west Africa.
The BBC's security correspondent Frank Gardner says Saudi Arabia generally prefers to conduct its foreign affairs through low-key, behind-the-scenes discretion.
The BBC's security correspondent Frank Gardner says the move is a significant step-up in operations, but one that also risks escalation.
Whitehall officials told BBC security correspondent Frank Gardner there was no evidence anyone with al-Qaeda sympathies had ever been recruited into MI5.
The BBC's Security correspondent Frank Gardner says Saudi Arabia has so far resisted the wave of change that has swept over much of the Arab world.
"But those originally holding her may well have considered it not worth the risk and have reportedly sold her on, " said BBC security correspondent Frank Gardner.
The BBC's Frank Gardner said the teams have already begun training on skis and were recently in Iceland, getting their first taste of a howling blizzard on a glacier.
The BBC's security correspondent Frank Gardner says the British government has provided technical training to the team, whose mission has been delayed by diplomatic wrangling over access and their security.
The BBC's Security Correspondent Frank Gardner said the move to suspend twice-weekly flights from Yemen to the UK was prompted by concerns that another attack on Western interests could be imminent.
The BBC's security correspondent Frank Gardner says the latest video is important because it is the first new footage of Bin Laden seen in more than a year, even though there is no independent confirmation that it was actually filmed this year.
Border security has dramatically worsened in the aftermath of the revolution, as thousands of illegal immigrants, drug smugglers and gun runners try to slip from impoverished Yemen into Saudi Arabia, one of the world's richest countries, Lt al-Ahmari told the BBC's Frank Gardner.
It's the last show for presenter Liz Carr, and we play some old clips like when we took the newly disabled BBC correspondent Frank Gardner through a checklist of benefits to see if he was getting them and being looked after - a bit cheeky really.
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