Police are asking for any information or sightings of missing Alexandra teenager, Caitlin.

According to police, Caitlin was last seen getting off a school bus around 8am yesterday morning, Tuesday July 27.

"The 17-year-old has been reported missing from her home in Alexandra," police say.

"Police have been making inquiries to locate Caitlin and are seeking any information from the public which may assist in finding her.

"Police and Caitlin's family hold concerns for her welfare."

She is believed to be wearing a black jacket, black jeans, black boots and a dark green jersey.

If you have seen Caitlin or have any information on her whereabouts, please contact police on 105.