WASHINGTON - A military hospital here is coping with a dramatic increase in amputees and other seriously injured American troops being flown back from battlefronts in Afghanistan, according to a media report. More than 1,000 American troops have been wounded in battle over the past three months in the war-torn country, accounting for one-fourth of those injured in combat since the US-led invasion in 2001, The Washington Post said Saturday, noting that October marks the deadliest month for US military. Defence Secretary Robert Gates has become concerned about the rising number of wounded and has ordered thousands of additional support troops to Afghanistan to look for, and minimise, the roadside bombs, Pentagon Press Secretary Geoff Morrell says. Expanded military operations, a near-doubling of the number of troops since the beginning of the year and a Taliban offensive that has included a proliferation of roadside bombings have led to the great increase in casualties, The Post reports. The US troops in Afghanistan are suffering wounds at a higher rate than those who were serving in Iraq when violence spiralled during the military surge two years ago, the report said. In mid-2007, 600 US troops were wounded in Iraq each month out of about 150,000 troops deployed there. In Afghanistan, about 68,000 troops are currently installed, with about 350 wounded each month recently. The Pentagon press secretary acknowledged that the casualties in Afghanistan had surpassed Iraq surge proportions and noted that the violence in Afghanistan was directed more against US and other coalition forces, whereas it was heavily sectarian in Iraq. It shows you how we are the targets and how effectively they are targeting us, Morrell commented. Military doctors say the nature of the Afghanistan casualties is reminiscent of those in Iraq in 2007. Were seeing similar types of injuries from Afghanistan that we saw in Iraq before and during the surge, Lt Col Shelton Davis, chief of Physical Medicine at Walter Reed Army Medical Centre in Washington, was quoted as saying in The Post dispatch. More than 1,000 improvised explosive devices, or roadside bombs, exploded or were found in Afghanistan in August, more than double any monthly total until this summer. The bombs account for 70 to 80 per cent of US and coalition casualties in that country, according to Lt Gen Thomas F Metz, Director Pentagons Joint Improvised Explosive Device Defeat Organisation. Metz told military reporters this week that IEDs were now the weapon of choice for Taliban fighters. According to Metz, the bombs are so powerful that they can take out the latest mine-resistant vehicles the Pentagon has employed to protect troops. In addition, insurgents have begun targeting troops on foot. He said the rise in bombings had coincided with the doubling of US troop numbers and that further troop increases - now under consideration by President Obama - would bring more bombs. As US ground forces moved in this year, Metz said at a House Armed Services Committee hearing this week, the enemy was ready with a very thick array of IEDs. Those soldiers and Marines ran into those IEDs, and it was what we predicted. Walter Reeds Ward 57 provides wrenching proof of the devastating effectiveness of the bombs, with patients suffering amputations, spinal cord damage, traumatic brain injuries and fractures.