Toronto police are warning the public to stay alert after three young girls were reportedly approached and photographed while walking to school in the city's east end.

Police said that three suspicious incidents have occurred since last Wednesday in the area of Warden Avenue and Danforth Road.

Const. Tony Vella said the incidents involved students attending Warden Avenue Public School and Clairlea Public School, both in the Warden and Danforth area.

In a letter to parents, Warden Avenue Public School officials asked that the school community remain aware of the concern and contact authorities if anything seems amiss.

"We are fortunate to have a number of safety initiatives, programs, and policies that contribute to a safe and caring school. However, most incidents happen away from school," principal Quincy James wrote.

"With spring upon us, children will be outdoors more often so I want to emphasize again to all our students, staff, and parents the need to be aware and alert at all times, no matter where you are and even in the most ordinary and everyday routines."

In the first instance, a man was reportedly spotted taking pictures of young girls as they walked to school in the early morning of Wednesday, March 28.

The suspect is described as black, last seen wearing an orange t-shirt, with short black hair and a moustache.

In the second instance, two men in a green van were reportedly spotted attempting to speak with a nine-year-old girl as she walked to school at 8:30 a.m. on Monday, April 2.

The suspects were simply described as a white male and a black male.

Suspects matching those descriptions were also reported spotted in a white van attempting to speak to another nine-year-old girl on Tuesday, April 3, as she walked to school at about 8:30 a.m.

Police are reminding parents to speak to their children about remaining alert to their surroundings and are asking that any suspicious activity be reported.

Anyone with information in the incidents is asked to contact police at 416-808-4105 or Crime Stoppers anonymously at 416-222-TIPS (8477).