Afghanistan's defense minister says al-Qaida forces have teamed up with Taleban militants to launch a new wave of attacks.

Abdul Rahim Wardak told reporters Saturday in Kabul there are signs al-Qaida is regrouping and changing its tactics to focus again on Afghanistan.

He said militant attacks have increased in recent months more than officials expected. Afghanistan is scheduled to hold parliamentary elections in September.

Meanwhile, a Taleban spokesman claims Afghan rebels have executed an American commando the militants say they captured, but the U.S. military says it has no information to support the claim.

The military says it is still searching for the Navy SEAL who disappeared with three other members of his special operations unit during a clash with insurgents in Kunar province in June.

Some information for this report provided by AFP and Reuters.