A、On Saturday. B、On Friday night. C、After midnight. D、In the daytime. B新闻中提到，本次袭击开始于周五晚上，在夜色的掩护下，一直持续了很长时间。

Attackers assaulted a luxury hotel in Burkina Faso overnight, shooting some and taking others hostage in a siege that lasted hours and ended with 29 people dead. An al Qaeda-linked terrorist group claimed responsibility for the assault at Splendid Hotel—a popular meeting place for Western diplomats in the capital, Ouagadougou. The attack began on Friday night and dragged on under the cover of darkness. Security forces entered the hotel early Saturday and freed 126 hostages, half of whom were hospitalized, according to Burkina Faso’s foreign minister, Alpha Barry. Of the 29 people who died, 22 have been identified, Ouagadougou prosecutor Maziza Sereme said. President Roch Marc Christian Kabore told the nation more than 50 people were wounded. The injured included two Burkinabe police officers, one soldier and one service member from France. It was unclear whether the death toll included the three attackers that Kabore said were killed.
1. What is the news report mainly about?
2. When did the incident occur?