RUWEISHED, Jordan — Scores of armored vehicles and Humvees with mounted machine guns have replaced the swarm of truck convoys on the gritty Jordanian desert border with Iraq after Sunni insurgents reportedly captured key crossings to Jordan and Syria earlier in June.

At least 10 tanks were seen dotting the border town of Karameh after Jordanian army units had been put on a state of alert in recent weeks along the country’s 200-kilometer (120-mile) eastern border, one of the Middle East’s busiest trade arteries.

Officials said rebels took over two key crossings in the predominantly Sunni Anbar governorate in western Iraq, the Treibel crossing with Jordan and the Walid crossing with Syria after Iraqi government forces had pulled out.

Initial reports suggested that fighters of the Islamic State of Iraq and al-Sham (ISIS) had taken over the Iraqi-Jordanian border crossing. However, Jordanian military personnel, speaking anonymously at the border, dismissed the claim, telling Al-Monitor that Iraqi troops loyal to the Shiite-led government of Prime Minister Nouri al-Maliki were officially still holding the crossing point, though they suspected Sunni tribes were in control of the surrounding area.