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

Greece Bombs - All outgoing airmail from Greece has been suspended for 48 hours after another letter bomb was found in Bologna on late Tuesday addressed to Italian PM, Silvio Berlusconi. After another letter bomb was sent to the office of German Chancellor Angela Merkel earlier on Tuesday, and more than 10 letter bombs were found in Athens near embassies and on airmail carriers.

Merkel Integration summit - A summit on social and ethnic integration is due to take place in Berlin Wednesday, hosted by the German chancellor, Angela Merkel. National and regional leaders are expected to attend, as well as reps of migrants and ethnic minorities, to discuss ways of improving integration in the country.

Russia 2018 bid - The head of Russia's 2018 World Cup bid campaign talks to CNN about allegations of bribery in the Russian camp following the suspension of two FIFA delegates. The Sunday Times newspaper in the UK accused Russia of trying to buy FIFA executive Amos Adamu's vote, while Russia in turn alleged the UK newspaper was trying to boost England's chances.

AC Milan v Real Madrid – Champion’s League Matchday 5 includes AC Milan vs. Real Madrid at Milan, probably most high-profile fixture of the day.

Titanic exhibition - More than 300 artifacts from the Titanic will be on display at London's 02, some of which have never been seen before. The exhibition will also include extensive room recreations and unseen footage from Titanic Expedition 2010.

Serbia earthquake - Serbian state television reports that the earthquake that struck at 01.56 CET, killing two people and injuring around 100. The epicentre of the 5.4-magnitude quake was near the city of Kraljevo in south of the country.