UN convoy targeted in explosion in east Libya: spokeswoman By Mohammed al-Tommy and Hadeel Al-Shalchi BENGHAZI, Libya, April 10 (Reuters) - A bomb was thrown at a convoy carrying the head of the United Nations mission to Libya on Tuesday, a U.N. spokeswoman said, but no one was hurt in the explosion. The attack in the eastern city of Benghazi is the first of its kind targeting a foreign mission since last year's revolt overthrew Libyan leader Muammar Gaddafi, and is likely to raise concerns about instability in the country. While on a visit to Benghazi the head of the U.N. support mission in Libya had what appeared to be an explosive device thrown at his convoy. No one has been hurt and the authorizes are investigating," said the U.N.'s Hua Jiang. The head of mission, Ian Martin, is a British citizen who was appointed to the post in September last year by U.N. Secretary-General Ban Ki-moon. He has also worked as a U.N. envoy in conflict zones including Gaza, East Timor, Rwanda and the former Yugoslavia. He was previously Secretary General of human rights organization Amnesty International. A security official who was traveling with the convoy, but declined to give his name, said the home-made device was thrown while the convoy's five armored vehicles was pulling into the parking area of the Supreme Security Commitee's building where they had a meeting. The attacker missed the convoy and the device exploded about four meters away from the convoy, a Libyan intelligence source told Reuters, leaving a small hole in the road. It was unclear who had thrown the bomb, but security analysts have warned that in the security vacuum left by Muammar Gaddafi's fall, there is a risk that loyalists of the former leadership or Islamist militants could mount an insurgency along the lines of the one in Iraq after the United States invaded and toppled Saddam Hussein. The attack on the U.N. head of mission could have an impact on plans by international oil companies to re-start their operations in Libya. They have been sending out teams to inspect the oil fields they abandoned during the revolt last year, and are preparing to send expatriate staff back in. If there is a heightened risk of attacks on Western targets, they might have to reconsider those plans. Reporting by Mohammed al-Tommy; Writing by Hadeel Al-Shalchi; Editing by Karolina Tagaris