A woman was killed and five other people were wounded in northern Lebanon on Sunday from gunfire coming from across the border in Syria, a Lebanese security source told the German Press Agency DPA.
Among the injured was a Lebanese soldier, the source said.
The area of Bakiya near Lebanon's northern border with Syria has recently had an influx of Syrian refugees fleeing the violence in their country.
More than 5,000 Syrians have fled since April 28 to escape the crackdown by security forces in the area of Tal Kalakh in western Syria.
On Saturday, the Syrian army shelled Tal Kalakh, according to opposition sources, and an estimated 300 Tal Kalakh residents fled across the border to Wadi Khaled in north-eastern Lebanon.
Human rights groups say more than 775 people have been killed in Syria since the start of the protest movement against the regime of President Bashar al-Assad in mid-March.