Jerusalem (CNN) -- The Israeli military said rockets were fired from Lebanon into northern Israel on Monday and that its troops returned fire.
No one was hurt in the incident on either, but the Israel military said it was "operationally prepared."
"The IDF (Israel Defense Forces) regards this incident as severe, and holds the Lebanese government and the Lebanese Army responsible for preventing any rocket fire at Israel," the military said.
The Lebanese National News Agency said Israel fired four missiles in response, which caused minor damage.
Israel fought a five-week war with the Lebanon-based group Hezbollah in 2006.