At 5 a.m. Tuesday morning, the Turrialba Volcano, located east of the province of Cartago, began to spew gas and ash from two crater openings, the Volcanological and Seismological Observatory of Costa Rica (Ovsicori) reported.
By 8:30 a.m. a significant amount of volcanic material was released from the two openings of volcano, "which may indicate that these materials come from deep areas,” Ovsicori said.
"It is uncertain what will happen. Volcanologists are heading to the site to evaluate the activity," the statement said.
Experts said Tuesday's activity is “normal for an active volcano such as Turrialba,” but they recommended all nearby communities remain vigilant in coming hours.
The released material fell into grasslands and communities in the canton of Turrialba and reached some three kilometers west of the crater.
The trail of gases and ash can be seen from various locations in the provinces of Cartago, San José, Heredia and Limón. Public access to the volcano area was closed last year due to the activity.
The Turrialba Volcano also emitted material in 2007, 2010 and 2012. The last eruptions of the volcano were in 1884.