carolyn malone reports. >> the shooting happened inside a well guarded hospital.he attacker was supposed to be protecting those inside. one of the security guard opened fire on three foreign nationals. people outside the compound heard the attack. i heard gunfire, and then i was told that three were shot dead. >> one of the leading institutions in maternal health care. one of those killed was a pediatrician, who had been working in the hospital for seven years. >> they were not carrying guns they did not have military uniforms they came here under immense pressure, this was an inhumane attack. and unfortunately it will impact our health service. >> the motive is not yet known, but there have already been a number of attacks this year. a photographer was killed and another journalist injured after being shot by a police officer earlier this month. as afghan forces gradually take over control of security, these types of attacks appear to show no sign of ending. carolyn malone, al jazeera. >> republican cazimmermann is a fellow at the trueman national security projec