The suspect, who did not fire his gun, was only briefly in the Friedrich-Ebert School and later fled on a motorcycle, Reutlingen police (Polizei Reutlingen) said on Twitter.
After receiving calls from students, the police locked down and searched the school, finding nothing suspicious, Xinhua reported.
Police described the suspect as "male, aged 17-19, 170-180 cm tall, bearded, darker skin" on Twitter.
Other nearby schools and kindergartens were also locked down, but police eventually said there was no more threat at school and all the students were able to go home.
Local and federal police have blocked some of the streets in Esslingen and deployed helicopters to help hunt the suspect. Police said on Twitter the manhunt will continue.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.