Just days after Philadelphia abortionist Kermit Gosnell was sentenced to three life terms for his horrific abortion practices -- including snipping the spines of babies born alive -- a Houston abortionist's former employees are accusing him of similar criminal acts, WORLD reports. Late Wednesday evening, the Harris County District Attorney's office confirmed to Houston's local KHOU 11 News that the allegations were under investigation and are "very similar on the surface" to the Gosnell case. The pro-life group Operation Rescue gave Houston prosecutors a video it produced containing interviews with three people claiming to be former employees of abortionist Douglas Karpen. A fourth informant, who remains anonymous, has also come forward to Operation Rescue, filing an affidavit about her experiences. The women backed up their claims with cell phone evidence, said to be taken at Karpen's facility, the Aaron Women's Clinic. "The photos show babies that are huge, with gashes in their necks, indicating that these babies were likely born alive, then killed," said Troy Newman, president of Operation Rescue. "... There are numerous similarities between Karpen and the Gosnell case, including the disregarding of complaints by the authorities that allowed both men to continue their illegal operations." Texas Lt. Gov. David Dewhurst called for a "full-scale" investigation; the district attorney's office said its investigation began before the lieutenant governor demanded a probe.