Fifteen British navy personnel seized by Iran on Friday are currently being interrogated and will have to answer to allegations they violated Iranian waters, an Iranian official said on Monday.
The British government has meanwhile kept up pressure on Iran as the row sends out shockwaves around the world.
Prime Minister Tony Blair labelled the group's seizure "unjustified and wrong" and Foreign Secretary Margaret Beckett lobbied for their safe return in a phone call on Sunday with Iranian Foreign Minister Manouchehr Mottaki.
And with tensions rising in the region over both their capture and Iran's disputed nuclear programme, oil prices rose to their highest levels this year -- well above 62 dollars in Asian trade.
