LONDON, United Kingdom?Two men were being questioned Sunday after one parcel bomb was sent to Britain's MI6 foreign intelligence agency and another was intercepted.

The two suspects, aged 52 and 21, were arrested on suspicion of explosives offenses on Friday at separate addresses in Caernarfon, northwest Wales.

Detectives were searching two addresses in the royal seaside town.

Police were called on Wednesday after a suspicious package was found at the Secret Intelligence Service building in Vauxhall, south London.

A second suspected parcel bomb was discovered at a south London postal sorting office on Thursday.

"The Metropolitan Police Service is investigating two suspect packages addressed to premises in central London," said a spokesman for the city's police force.

"Both packages have been recovered by police."

The agency is still commonly known by its old MI6 name. Its riverside headquarters is the home base for the fictional British spy James Bond and the building has featured in several 007 films.