"Earlier today, the IAF (Israeli air force) struck infrastructure that was used to smuggle weapons via Syria to the Hezbollah terrorist organisation in Lebanon at the Janta crossing on the Syrian-Lebanese border," the military said in a statement.

It did not specify whether the strikes were on the Syrian or Lebanese side, but they came a day after Lebanon's army accused Israel of "violation of the ceasefire agreement by attacking Lebanese sovereignty and destroying southern towns and villages".

There is no official crossing point near Janta but the area is known for illegal crossings.

The UN peacekeeping force in southern Lebanon, UNIFIL, has also expressed concern over "continuing destruction" caused by Israeli forces in south Lebanon.

The Israeli military said Friday's strikes were aimed at preventing weapons falling into the hands of Hezbollah, with whom it fought a land and air war for more than a year until a ceasefire was agreed upon last month.

"These strikes are an additional part of the IDF's (Israeli military's) effort to target weapons smuggling operations from Syria into Lebanon, and prevent Hezbollah from re-establishing weapons smuggling routes," the military said.

"The IDF will continue to act to remove any threat to the state of Israel in accordance with the understandings in the ceasefire agreement."

The truce went into effect on November 27, about two months after Israel stepped up its bombing campaign and later sent troops into Lebanon following nearly a year of exchanges of cross-border fire initiated by Hezbollah over the war in Gaza.