Zhao's wife had reported on Thursday that he was taken away by plainclothes police, sparking fears for his safety, but postings by Zhao later in the evening said he had been sent back home.

Zhao said security personnel were continuing to harass him but defiantly vowed to carry on his fight for justice in the scandal which saw six children die and 300,000 others made ill after they ingested milk tainted with melamine.

"The issues faced by all these children must be resolved. I will not stop even if they smashed my body to pieces," he said.

Zhao, whose child was one of those who fell ill, was freed on medical parole in December after being sentenced to two-and-a-half years in prison the month before for "disturbing social order".

Since then, Zhao has been posting prolifically on Twitter, calling for justice in the case and the release of activists, lawyers and dissidents swept up in an ongoing Chinese government crackdown on dissent.

Zhao has implied in previous tweets that he faces restrictions on his movements.

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