An update from the CNN newsdesk in London on the stories we're following on Tuesday:

Ukraine bus crash – A collision between a bus and a train in the Ukraine left 40 people dead, officials say.   The crash took place when a commuter bus and a railway locomotive collided in Ukraine's Dnipropetrovsk region, according to Ukraine's Emergency Situations Ministry.

Hostage death – President Obama has offered his condolences to Prime Minister Cameron for the death of British hostage, Linda Norgrove, in Afghanistan. It is thought that she may have been a victim of "friendly-fire" rather than been killed by a captor’s suicide belt as originally thought. Both leaders have pledged a full investigation into the death.

Toxic sludge - Frantic efforts are being made to try to complete an emergency dam wall which may prevent a second tide of toxic red sludge in Western Hungary. The President of European Commission, Jose Manuel Barroso, will meet with the Hungarian PM today to discuss the crisis.

France strike - Trade Unions in France are holding a day of protests and strike action throughout the country today. The strike action, instigated because of proposed changes in retirement age, has been vehemently opposed by most French people and has remained one of Sarkozy’s most unpopular policies.

Liverpool FC – Liverpool’s American owners are contesting the English football club's proposed sale in the British High Court on Tuesday, and if they win it could see the five-time European champions put into administration.  Phil Black reports live from the High Court.

Kit Kat anniversary - One of the UK’s oldest and most iconic brands, Kit Kat, celebrates its 75th anniversary today.  Launched in 1935, Kit Kat has seen many changes through the years including its recipe having to be altered during rationing in World War II. Ayesha Durgahee goes to the Kit Kat Factory in York to find out what is behind Kit Kat's longevity and success (and gets to make her very own Kit Kat.)

Slovakia austerity - Trade unions in Slovakia are scheduled to stage a protest meeting in Bratislava at 10aET. Around 4,000 people are expected to take part.

Clinton visit – U.S. Secretary of State Hillary Clinton visits Bosnia-Herzegovina, Serbia, Kosovo and Belgium through Thursday.