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Three people have been shot at a college campus in Texas today.

Lone Star College's North Harris Campus, near Houston, went into lockdown after reports of a shooter on site.

One person was arrested while a possible second gunman is being hunted by police.

Witnesses reported hearing up to eight shots shortly after midday local time.

Aerial footage from local television stations showed police cars and ambulances parked on the campus.

Emergency personnel could be seen tending to people on stretchers, while others ran from a building led by officers.

(Image: Sky News)

The college issued an alert telling students and staff to take immediate shelter or avoid the campus.

A health service spokeswoman said three people were injured and two were taken to Harris Health Ben Taub Hospital Emergency Centre.

Cody Harris, 20, said he was in a classroom with about six or seven other students waiting for a psychology class to start when he heard eight shots.

He and other students looked at each other, said "I guess we should get out of here," and fled.

"I was just worried about getting out," Harris said. "I called my grandmother and asked her to pick me up."

The Lone Star College System has 90,000 students and six college campuses.

Along with the college, four nearby schools in the Aldine Independent School District went into lockdown.

Lone Star student Daniel Flores, 19, said he was in a tutoring lab on the second floor doing homework when he heard what he heard six to seven shots.

"I didn't think they were shots," he said. "It sounded like someone was kicking a door."

About 60 people were in the lab, and they began running out of the room once they realised the sound was gunfire, he said.

They fled to a nearby student services centre, where authorities kept them there for about 30 minutes before letting them go.