Police have been preparing to seek summon or arrest warrants against "red-shirts," who broke into the parliament compound earlier Wednesday, Metropolitan Police Commander Lt-General Santhan Chayanon said.

Police recorded the invasion and were collecting evidence in a bid to seek the warrants, Thai News Agency reported.

In a related report, the website of the Thai-ASEAN News Network said the police are going to seek the warrants against red-shirts' core leader Arisman Pongruengrong and his associates for trespass, which has forced Prime Minister Abhisit Vejjajiva to cancel a trip on April 10 to the United States to attend the "World Nuclear Conference," and the suspension of the scheduled House meeting and the ongoing cabinet meeting.

Also, police have summoned 19 "red-shirts" for the closure of the Ratchaprasong Intersection.

At about 13:45 p.m., the "red-shirts" started to leave the parliament compound.

Tens of thousands of the protestors led by the United Front for Democracy against Dictatorship (UDD) group have converged on capital Bangkok since March 12 to press Abhisit to dissolve the House and call a new general election.

The "red-shirts" main rally site is now at the Phan Fah Bridge and Rathchaprasong Intersection in central Bangkok.