Brazilian news reports say the police are making arrests at the home of former President Luiz Inacio Lula da Silva.

Brazil's O Globo news network is running images of police officials around a building they say is Silva's residence in Sao Bernardo de Campo, in greater Sao Paulo.

The network's G1 internet portal cites federal police sources as saying they are serving out an arrest warrant that will oblige Silva to testify.

In a statement on their website, the police say they are carrying out 44 judicial orders, but have not confirmed the identities of those targeted.

Friday's detentions are taking place under the ongoing probe into corruption at Brazil's Petrobras oil giant.