MANADO, Indonesia (AP) — Indonesia’s Mount Ruang volcano erupted Tuesday for a second time in two weeks, spewing ash almost 2 kilometers (more than a mile) into the sky, closing an airport and peppering nearby villages with debris.

The alert level of the volcano on Sulawesi Island was again raised to the highest level by the Indonesian geological service, after sensors picked up increasing volcanic activity. The agency urged residents and climbers to stay at least 6 kilometers (3.7 miles) from the volcano’s crater.

The 725-meter (2,378-foot) volcano in North Sulawesi province is about 95 kilometers (59 miles) northeast of Sam Ratulangi International Airport in Manado, the provincial capital.

The airport was closed Tuesday morning due to reduced visibility and the dangers posed to aircraft engines by ash, said Ambar Suryoko, head of the regional airport authority.