India, Feb. 18 -- The Visalia Unified School District in South-Central California has launched an investigation after a photo that surfaced on social media raised concerns. The photo shows a group of about 10 students at Redwood High School, donning shirts with letters and numbers that spell out something that the district has said is a "hateful homophobic slur," according to ABC 7.

"A lot of people at school, including the senior class, are really upset about the ignorant and rash actions of people who were in the photo," said an unnamed Redwood High senior.

According to officials, the photo was taken Thursday, February 12, during school hours. It was taken immediately after a senior class photo shoot. The students seen in the photo ar...