The activities and traffic of warplanes- especially at nights- has lately increased in the US airbases in Nasiriya southeast of Baghdad and Haditha a city in the western Iraq province of Al Anbar, the Iraqi residents and sources said.
They said the US fighters, cargo planes, helicopters and unmanned planes have intensified their flights in the last three weeks.
The US military officials have imposed severe security measures around the bases, they said.
They said some aircraft suspected to be Israeli warplanes coming from Jordan, have landed in the US controlled al-Assad airbase near Haditha.
It is believed that these activities are parts of a joint Israeli-US training, preparation and coordination to launch an air raid against Iran's nuclear plants.
Israel has conducted a military drill under the supervision of top US military commanders over the Mediterranean Sea from May 28 to June 12, using more than 100 Israeli F-16 and F-15 fighters, along with helicopters and refueling tanks which many consider as a possible rehearsal for a strike on Iran's nuclear facilities.