Two NATO-led international troops were killed in separate attacks in southern Afghanistan while a military helicopter made a forced landing, the alliance said Sunday. The soldiers were killed Saturday in an insurgent attack and a roadside bombing, NATO forces said without giving details, according to a report of DPA. A coalition helicopter made a forced landing in the south of the country. Officials didn't disclose the location nor cause of the incident. "Initial reporting indicates that there was no enemy activity in the area. All crew members have recovered with no reported fatalities," it said.