MAX trains are experiencing major delays Thursday afternoon because of signal issues caused by vandalized cables, TriMet officials said.

Blue, Green and Red lines are delayed by signal issues near the Hollywood Transit Center, officials said on Twitter. Officials announced the delays on Twitter at about 4 p.m.

The signal issues were caused by vandalism of high-voltage cables near the Hollywood station, TriMet spokeswoman Tia York said.

Temporary repairs are complete, but riders should expect delays through the commute hours, she said.

Maintenance crews will complete permanent repairs Thursday night when MAX trains are not running.

"We'd like to apologize to our riders for the significant delays that our MAX Blue, Green and Red Lines have experienced this afternoon," York said.

TriMet is investigating the incident and is offering up to $1,000 for information leading to the arrest of the responsible person, she said.

— The Oregonian/OregonLive