KABUL, Afghanistan (AP) — Gunmen riding on a motorcycle opened fire and killed two Finnish women aid workers in the western Afghan city of Herat on Thursday, officials said, the latest in a series of attacks on foreign civilians that has rattled aid workers, contractors and journalists. Militants carry out near-daily attacks in Afghanistan, usually targeting security forces, which have struggled to secure the country as foreign troops have been gradually withdrawn. Earlier on Thursday, a bombing in a market in northern Afghanistan killed six people, including a young girl, while a separate attack in the east killed a local police commander and his bodyguard, officials said. The attack in the market was aimed at a police car but the police escaped unharmed, said Sonatullah Timor, the spokesman for the Takhar provincial government. In a separate incident, a suicide bomber detonated his payload at a checkpoint in the eastern Nangarhar province, killing a local police commander and his bodyguard, according to police spokesman Hazrat Hussain Mashraqiwal.