Ten Things You Need to Know Today: Sunday 20 Jan 2013

Some of the Britons caught in the four-day siege in Algeria returned home overnight but five British nationals and a UK resident are believed dead or missing. The siege ended on Saturday with an army raid that killed all the hostage takers. "This attack is another reminder of the threat posed by al-Qaeda and other violent extremist groups in North Africa," said Barack Obama.

A gunman attempted to assassinate a Bulgarian politician during a televised speech. The armed man took to the stage and pointed a small black pistol at the head of Ahmed Dogan, the leader of Bulgaria's Movement for Rights and Freedoms party. The attacker appeared to attempt to fire the gun before security guards wrestled him to the ground.

Heathrow Airport is under attack for its inability to cope with two inches of snow that has fallen in recent days. A travel expert said the airport turned into “a refugee camp” as 500 flights were cancelled on Friday and Saturday. Local hotels are charging up to £600 a night to desperate passengers. At least 260 more flights could be axed on Sunday as the cold snap continues.

Four people died after an avalanche in Glencoe in the Scottish Highlands on Saturday afternoon. A fifth was left with head injuries. The Reverend Moira Herkes, who will lead prayers for the dead on Sunday, said "It is very distressing, because people come here for pleasure and when something like this happens it hurts everyone involved."

The world's largest family could be on the brink of becoming 200 strong. The Ziona family has at least 181 members including 94 children and 33 grandchildren. Its head, Pu Ziona, has 39 wives. However, the Times Of India claims the total will hit 200 with the imminent arrival of three children. When asked by the press for a definitive total, the family requested more time to work it out.