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Belgian police officers and soldiers secure an area as a reported police intervention takes place around the Grand Place central square in Brussels on November 22, 2015. Brussels will remain at the highest possible alert level with schools and metros closed over a "serious and imminent" security threat in the wake of the Paris attacks, the Belgian prime minister said. AFP PHOTO / EMMANUEL DUNAND        (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
Belgian police officers and soldiers secure an area as a reported police intervention takes place around the Grand Place central square in Brussels on November 22, 2015. Brussels will remain at the highest possible alert level with schools and metros closed over a "serious and imminent" security threat in the wake of the Paris attacks, the Belgian prime minister said. AFP PHOTO / EMMANUEL DUNAND        (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)

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Belgium: 16 arrested during house searches

CNN's Max Foster discusses the ongoing terror investigation in France and across Europe, the manhunt involved and the security precautions being taken.

Belgium: 16 arrested during house searches

CNN's Max Foster discusses the ongoing terror investigation in France and across Europe, the manhunt involved and the security precautions being taken.