Lebanese army soldiers at the site of suicide bomb attacks in Qaa, June 27.

BEIRUT — Lebanon’s army said on Thursday it had foiled planned terrorist attacks by ISIS on a tourist site and a crowded area, days after multiple suicide bombers killed five people in the border village of Qaa.

Five people involved in the two thwarted attacks, including the mastermind, were arrested on Thursday, an army statement quoted by the National News Agency said.

“Those arrested confessed to having carried out terrorist acts against the army previously. Investigations are continuing,” the army said.

Lebanese security services have been on heightened alert for in recent weeks. ISIS had urged its followers to launch attacks on “non-believers” during the Muslim Holy Month of Ramadan, which began in early June.

The government warned this week of a heightened terrorist threat after eight suicide bombers targeted Qaa, a mostly Christian town, on the border with Syria on Monday, killing five people.

Prime Minister Tammam Salam said he feared “a new wave of terrorist operations.”

Lebanon has been repeatedly jolted by attacks linked to the war in neighboring Syria.

A bombing attack south Beirut, claimed by ISIS, killed more than 40 people in November.

The army said it had arrested more than 400 Syrians in a series of raids in recent days, on suspicion of illegal entry into Lebanon or illegal movement inside the country.

Interior Minister Nohad Machnouk said on Tuesday most of Monday’s attackers came from Syria.