Week 3 - Paris

French police have detained four people over the Islamist attacks in Paris on a satirical magazine and a Jewish supermarket in which 17 people died.

A woman police officer and three others are believed to have had connections with Amedy Coulibaly, who was killed by police during the supermarket siege.

A suspect named as Amar has been in custody since January on drugs charges.

But investigators have used his phone data to place him not far from the supermarket just before the attack.

They think that Amar, said to have been close to Coulibaly, may have been watching the target.

All four suspects were placed under formal investigation on Monday.

Amar's girlfriend, a convert to Islam, is a policewoman who worked at a police intelligence centre in the Parisian suburbs.

She is believed to have looked at Amar's police file after the January attack and sent it on to him.

She has now been suspended.

Two other people known to Coulibaly are also being questioned by police.

So far, six other people are under judicial investigation under suspicion of providing help to Coulibaly and Said and Cherif Kouachi, the BBC's Hugh Schofield reports from Paris.

The French capital was traumatised by the attacks, which began on 7 January when the Kouachi brothers killed 12 people at the offices of Charlie Hebdo magazine.

Coulibaly shot dead a policewoman in the south of Paris the following day and on 9 January attacked the supermarket, killing four people before police shot him dead.

Police also besieged and killed the two brothers.

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Why：
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http://www.bbc.com/news/world-europe-31803331

Week 2 - Sydney

Sydney siege: Hostages held in Lindt cafe

A gunman is holding staff and customers hostage at a cafe in Sydney, Australia.

The Lindt cafe in the city centre is surrounded by armed police. Officers have made contact with the gunman.

Five people have been seen running from the building. It is not clear how many remain inside. A black Islamic flag has been displayed at the window.

Prime Minister Tony Abbott said it was "profoundly shocking" that people were being "held hostage by an armed person claiming political motivation".

He was speaking after chairing a meeting of the national security committee in Canberra.

Earlier Mr Abbott said: "Australia is a peaceful, open and generous society - nothing should ever change that and that's why I would urge all Australians today to go about their business as usual."

Senior police officers say they are on a footing "consistent with a terrorist event".

The incident began as people were arriving for work in Martin Place on Monday. Witnesses saw a man with a bag and gun walk into the Lindt chocolate shop and cafe.

Lindt said about 10 employees and 30 customers were thought to be inside at the time. Nearby offices were evacuated and police asked people to remain indoors and away from open windows.

The BBC's Jon Donnison in Sydney says an enormous police operation is in place, on a scale few Sydney residents will have seen.

About six hours into the siege, three people were seen running from the building housing the cafe. Two more people followed about an hour later. It is not clear whether they escaped or were released.

New South Wales Police deputy commissioner Catherine Burn said: "Those people are now being assessed to make sure their health is okay and then police will talk to them."

"Our approach is to resolve this peacefully. It might take a bit of time but that is our priority," she added.

Police have identified the gunman and he is well known to them, Australian media report.

News organisations also say the suspect has contacted them to issue demands, which police have urged media not to report.

Channel 7, a broadcaster with offices facing the cafe, said lights inside the premises were turned out as night fell.

Structure of the Lead：
Who：employees&customers
When：Monday
What：hostage
Why：political motivation
Where：café

Keywords：
1.chair：入座
2.siege：圍城
3.deputy：代理人
4.commissioner：專員

Week 1 - Mexico

Mexico: Thousands march for missing Ayotzinapa students

The parents of 43 Mexican students who went missing five months ago have been leading a march in Mexico City to call for a full investigation.

Thousands of people have joined the protest, carrying banners with pictures of the missing trainee teachers.

Prosecutors say the students were arrested by corrupt police officers after a demonstration in the town of Iguala on 26 September.

They were handed over to a local criminal gang, who killed them.

The students attended a teacher training college in Ayotzinapa, in south-western Guerrero state.

The college has a history of left-wing activism but it is not clear whether the students were targeted for their political beliefs.

Attorney General Jesus Murillo Karam said the criminals burned the bodies in a nearby waste disposal site and scattered their ashes in a local stream.

Forensic experts in Austria carried out DNA tests on bone fragments found in a bag in the area and managed to identify one of the 43 students.

Analysis: Katy Watson, BBC News, Mexico City

It has been five months and the families still await answers but they are not giving up hope. The disappearance of the students has mobilised many Mexicans who say enough is enough.

One supporter at the march carried a sign saying she wanted to be one of the Mexicans to make a difference, not one of the many who seems indifferent to the thousands of disappearances in this country in the past few years.

The call for President Enrique Pena Nieto to step down can be heard loud and clear in the crowds here.

But relatives and independent investigators reject the official version of events.

They have held a series of demonstrations over the past five months to demand that the government do more to find the students.

Prosecutors believe the Iguala mayor, Jose Luis Abarca, ordered the students' arrest because their protest disturbed a planned political speech by his wife, Maria de los Angeles Pineda.

Both have been arrested and charged with involvement with organised crime.

Structure of the Lead：

Who：43 missing Mexican students' parents
When：2/27
What：march
Why：protest the government
Where：Mexico

Keywords：

1.call for：要求
2.banner(s)：旗幟
3.trainee teacher(s)：實習老師
4.prosecutor(s)：起訴人
5.corrupt：腐敗的
6.scatter：分散
7.fragment(s)：碎片
8.mobilize：動員