Lakeside Alliance, a joint venture of multiple construction companies working on the center, issued a statement saying they reported the incident to police and “will provide any assistance required to identify those responsible.”Work remained paused on Friday, according to a spokesperson for the joint venture, though CNN observed crews moving heavy machinery at the site.“The Chicago Department of Transportation has a significant project that surrounds the site on three sides, and their work is ongoing.”The spokesperson said “ancillary construction services required to maintain the safety and security of the site may occur throughout the day.”The group is offering a reward of $100,000 for information leading to those responsible, according to an earlier statement, on Thursday, which added that they have “zero tolerance for any form of bias or hate on our worksite.”“We are suspending all operations onsite in order to provide another series of these trainings and conversations for all staff and workers,” Thursday’s statement read, referencing anti-bias training that is part of its onboarding process.The Chicago Police Department told CNN they are “aware of this matter and it is under investigation.”The Obama Presidential Center was first announced in 2015, when the Barack Obama Foundation officially said Chicago’s South Side would be home to the project.In 2019, a federal judge dismissed a lawsuit that tried to prevent the library from being built in Jackson Park and said that construction should begin immediately.The lawsuit was brought by environmentalists who took issue with public land being used for a private project."