TIMELINE - Iranian election and aftermath

(Reuters) - Here is a summary of the main developments in the aftermath of Iran's June 12 presidential election, which took place against a background of tension with the West over Tehran's nuclear programme.

June 13 - Hardline incumbent Mahmoud Ahmadinejad officially wins presidential election with nearly 63 percent of the vote compared with 34 percent for reformist challenger Mirhossein Mousavi, authorities say. Thousands of protesters clash with police. Mousavi calls result a "dangerous charade."

June 14 - Mousavi says he has formally asked Iran's Guardian Council to annul the election.

June 15 - Seven people are killed during a huge march by Mousavi supporters in central Tehran, state media says. There are also pro-Mousavi demonstrations in the cities of Rasht, Orumiyeh, Zahedan and Tabriz.

June 16 - Leading Iranian reformist Mohammad Ali Abtahi, a former vice-president, is arrested, his office says.

-- The Guardian Council says it is ready to carry out a partial recount of ballots but rules out annulling the poll.

-- Tens of thousands of pro-Mousavi demonstrators march in northern Tehran. Ahmadinejad's supporters mobilise thousands of demonstrators in central Tehran.

-- Authorities ban foreign journalists from leaving their offices to cover street protests.

June 17 - Thousands march in central Tehran.