Two quizzed over MI6 parcel bombs
Two men were being questioned after a parcel bomb was sent to MI6's headquarters and a second was intercepted at a postal sorting office.
The suspects, aged 52 and 21, were arrested on suspicion of explosives offences on Friday morning at separate addresses in Caernarfon, North Wales, by officers from the Metropolitan Police and local police.
Police were granted more time to question the men on Saturday afternoon.
Searches were being carried out at two addresses in Caernarfon in connection with the arrests.
Police were called at around 12.40pm on Wednesday after a suspicious package was found at the MI6 building in Vauxhall, south London.
A second suspected parcel bomb was discovered at a sorting office in south London at around 4.30am on Thursday.
A spokesman for the Metropolitan Police said: "The Metropolitan Police Service is investigating two suspect packages addressed to premises in central London.
"Both packages have been recovered by police."