UPDATE: Riot Squad raids homes in Sydney's west following Downing Centre operation
Police have blocked off a street in Merrylands. (9NEWS)
Two houses have been raided by the Public Order and Riot Squad this afternoon following the massive police operation focused on the Downing Centre court building earlier today.
Police, including officers from the Riot Squad and the State Crime Command, raided the two homes in Merrylands about 3.30pm.
Police vehicles blocked off both ends of Lockwood Road while at least one PolAir helicopter hovered overhead.
Another raid occurred in a home on Blackwood Street.
The raids follow a massive police operation around the Downing Centre in Sydney's CBD this morning. Armoured vehicles and tactical officers swarmed the central court building on Liverpool Street in relation to an ongoing armed robbery trial.
A police spokeswoman confirmed this afternoon's operation in Merrylands was the result of an "ongoing operation".
Police remain at the scene.
Police said the raids are not terrorism-related.
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