Image: Taal volcano
Jason Gutierrez  /  AFP - Getty Images file
A file picture taken in September 2005 shows a farmer harvesting seaweed along the Taal lake while the Taal volcano is seen in the background. Magma rising to the surface of a volcano on a popular island close to the Philippine capital prompted the government on April 9, 2011 to push up its alert level to the second of five stages and urge visitors to stay away. While this does not mean an eruption is imminent, government volcano monitoring officer Julio Sabit said tourists and residents were warned to steer clear of Taal's crater and from thermal vents on its northern side.
updated 4/9/2011 2:44:26 PM ET 2011-04-09T18:44:26

Scientists warned Saturday that a picturesque volcano in the middle of a Philippine lake could erupt, and authorities stopped tourists from visiting it.

The Philippine Institute of Volcanology and Seismology said it raised the alert level for Taal Volcano because a growing number of volcanic earthquakes and a sharp rise in carbon dioxide emissions indicated rising magma.

It said 21 quakes were recorded over a 24-hour period ending early Saturday.

The institute warned that sudden explosions and high concentrations of toxic gas could be lethal to people and animals.

Taal, a tourist destination about 45 miles (75 kilometers) south of Manila, was declared off-limits to visitors as of Saturday, said Senior Inspector Manuel Maligaya, police chief of Talisay township on the shores of the lake in Batangas province.

Local officials also warned lakeside resort owners not to allow their guests to visit the island volcano.

The volcano has erupted more than 30 times since the 16th century. An eruption in 1911 killed nearly 2,000 people. A mild eruption in 1977 caused no damage or injuries.

Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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