Prime Minister Benjamin Netanyahu said Tuesday Israel was doing all that was "necessary" to ensure its security, following reports of an air raid against Hezbollah targets on the Syrian-Lebanese border.

"We are doing everything that is necessary in order to defend the security of Israel," Netanyahu said at a joint news conference in Jerusalem with visiting German Chancellor Angela Merkel.

"We will not say what we're doing or what we're not doing" to maintain Israel's security, he said in a cryptic reply to a question on the raid.

On Monday night, "two Israeli raids hit a Hezbollah target on the border of Lebanon and Syria," a Lebanese security source told AFP.