CHICAGO (CBS) — Three Chicago aldermen were among 37 people issued citations at a rally and march by immigration rights activists Thursday in the south Loop.

Ald. Proco Joe Moreno (1st), Danny Solis (25th) and Rey Colon (35th) each sat-in, in front of the U.S. Immigration and Customs Enforcement office at 101 W. Congress Pkwy. After initial discussions with police, the 37 were issued citations for criminal trespass, instead of being arrested and detained, said police commanders on the scene.

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No one was detained away from the scene.

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The sit-in followed a rally at which the featured speakers were activist Elvira Arellano and U.S. Rep. Luis Gutierrez (D-Ill.).

Gutierrez said he has been assured by President Barack Obama that if Congress fails to send him a comprehensive immigration package by July 4, he will begin making changes by executive order.

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He said he also has met with U.S. Homeland Security Secretary Jeh Johnson, and said Johnson appears ready and willing to make changes in the policies governing deportations, especially those that can split families.