(Adds comments by Lebanese security source, U.N. official)
JERUSALEM, Aug 7 (Reuters) - Four Israeli soldiers were wounded on Wednesday in an explosion on the border with Lebanon, a military spokesman said.
The troops were involved in "an activity near the border", the spokesman said, without providing further details of the circumstances of the blast. They were taken to hospital.
Israeli forces routinely patrol the frontier with Lebanon, which has been largely quiet since a war with Lebanese Hezbollah guerrillas in 2006.
A Lebanese security source said the incident may have taken place north of the border fence which separates Israeli and Lebanese forces, but on the Israeli side of a U.N.-designated "blue line" between the two countries.
He said the soldiers may have been wounded by a mine.
Another security source said the explosion was 150 metres (yards) south of the blue line.
Asked about the incident, Andrea Teneti, a spokesman for the U.N. peacekeeping force in southern Lebanon, said he had "no information in relation to our mandate of operations", and he described the situation as calm. (Reporting by Allyn Fisher-Ilan in Jerusalem and Oliver Holmes in Beirut, Editing by Jeffrey Heller and Elizabeth Piper)