CHRONOLOGY-Attacks in Nigeria's oil delta

June 4 (Reuters) - Gunmen in Nigeria have kidnapped two Lebanese construction workers in the southern oil-producing Niger Delta and are demanding a ransom for their release, security sources said on Wednesday.

More than 200 foreigners have been abducted, and mostly released in exchange for money, in the region where crime and militancy surged until late 2007 when there was a lull.

Below is a chronology of some major attacks and kidnappings in Nigeria's oil delta.

July 5, 2007 - A 3-year-old British child, Margaret Hill, is abducted in Port Harcourt. She is released on July 8.

-- July 7 - Oil major Royal Dutch Shell says one of its teams was attacked in Rivers state and two Nigerian workers taken hostage. The Nigerians are released on July 11.

-- July 12 - Francis Samuel Amadi, the 3-year-old son of a traditional ruler in the community of Iriebe, is kidnapped near Port Harcourt. He is released the next day.

-- Aug. 8 - Kidnappers release a Bulgarian and a Briton, employees of British oil company Exprogroup. They were abducted on July 8 from a barge near Calabar in Cross River state.

-- Aug. 28 - A Pakistani manager at a construction site run by Italian firm Gitto is released. He had been kidnapped on July 31 near Bodo in the Ogoni area of Rivers state.

-- Sept. 23 - Movement for the Emancipation of the Niger Delta (MEND) says it will recommence attacks on oil installations and abduction of expatriates following the arrest of leader, Henry Okah, on arms trafficking on Sept. 3.