Italy's volcanic Mount Etna spews lava during an eruption on the southern Italian island of Sicily April 11, 2013. Mount Etna is Europe's tallest and most active volcano. Picture taken April 11, 2013. REUTERS/Antonio Parrinello ( ITALY )
Italy's volcanic Mount Etna spews lava during an eruption on the southern Italian island of Sicily April 11, 2013. Mount Etna is Europe's tallest and most active volcano. Picture taken April 11, 2013. REUTERS/Antonio Parrinello ( ITALY )
Italy's volcanic Mount Etna spews lava during an eruption on the southern Italian island of Sicily April 11, 2013. Mount Etna is Europe's tallest and most active volcano. Picture taken April 11, 2013. REUTERS/Antonio Parrinello ( ITALY )
Italy's volcanic Mount Etna spews lava during an eruption on the southern Italian island of Sicily April 12, 2013. Mount Etna is Europe's tallest and most active volcano. REUTERS/Antonio Parrinello ( ITALY )
A round circle of smoke coming from the mouth of the Etna volcano is seen in the sky during an eruption on the southern Italian island of Sicily April 11, 2013. Mount Etna is Europe's tallest and most active volcano. Picture taken April 11, 2013. REUTERS/Antonio Parrinello ( ITALY )
Italy's volcanic Mount Etna spews lava during an eruption on the southern Italian island of Sicily April 11, 2013. Mount Etna is Europe's tallest and most active volcano. Picture taken April 11, 2013. REUTERS/Antonio Parrinello ( ITALY )
Italy's volcanic Mount Etna spews lava during an eruption on the southern Italian island of Sicily April 11, 2013. Mount Etna is Europe's tallest and most active volcano. Picture taken April 11, 2013. REUTERS/Antonio Parrinello ( ITALY )
Italy's volcanic Mount Etna spews lava during an eruption on the southern Italian island of Sicily April 11, 2013. Mount Etna is Europe's tallest and most active volcano. Picture taken April 11, 2013. REUTERS/Antonio Parrinello ( ITALY )
Italy's volcanic Mount Etna spews lava during an eruption on the southern Italian island of Sicily April 11, 2013. Mount Etna is Europe's tallest and most active volcano. Picture taken April 11, 2013. REUTERS/Antonio Parrinello ( ITALY )
Italy's volcanic Mount Etna spews lava during an eruption on the southern Italian island of Sicily April 11, 2013. Mount Etna is Europe's tallest and most active volcano. Picture taken April 11, 2013. REUTERS/Antonio Parrinello ( ITALY )
Italy's volcanic Mount Etna spews lava during an eruption on the southern Italian island of Sicily April 11, 2013. Mount Etna is Europe's tallest and most active volcano. Picture taken April 11, 2013. REUTERS/Antonio Parrinello ( ITALY )
Italy's volcanic Mount Etna spews lava during an eruption on the southern Italian island of Sicily April 11, 2013. Mount Etna is Europe's tallest and most active volcano. Picture taken April 11, 2013. REUTERS/Antonio Parrinello ( ITALY )