LONDON - Britain is taking seriously allegations that a British-Iranian citizen who went missing in Dubai in June may have been kidnapped by "elements in Iran", a government source in London said on Saturday.Abbas Yazdi was reported missing on June 25 and his wife Atena has told Dubai-based news website 7Days that she fears he may have been kidnapped by Iranian intelligence officers."We believe that allegations that elements in Iran might be responsible for Mr Yazdi's disappearance are plausible, and we are taking them very seriously," the source told Reuters.The Foreign Office said it was in contact with the authorities in Dubai and in Iran about the case and was providing consular assistance to Yazdi's family."We have asked the Iranians for any information they have about Mr Yazdi's whereabouts," a spokeswoman said."We are very concerned about Mr Yazdi's welfare."Foreign Secretary William Hague raised Yazdi's disappearance with his Iranian counterpart Ali Akbar Salehi during a telephone conversation on July 31.