This story has been updated with additional information.
A wind-driven grass fire that burned about 60 acres near Amarillo Boulevard and North Hughes Street, according to the Texas A&M Forest Service, damaged two structures and forced evacuations Monday afternoon, sending thick smoke across downtown and triggering a large multi-agency response that included aerial firefighting inside city limits. The blaze is now under investigation as suspected arson, officials said.
The Feb. 9 blaze, referred to as the Wildhorse Fire, ignited near a dried lake bed adjacent to Martin Luther King Jr. Memorial Park and was reported at 12:39 p.m., with Amarillo Fire Department crews arriving within five minutes, officials said…