CARACAS (Reuters) - Venezuela's self-proclaimed president, Juan Guaido, said on Thursday that agents from a feared special police unit were at his home asking for his wife, in a sign of increasing pressure on the opposition leader trying to topple the government.

"I will hold you responsible for any intimidation of my baby, who is just 20 months old," Guaido said at the end of a public event. He then left for home, asking diplomats to accompany him.

The United States, which backs Guaido, has warned of "serious consequences" if President Nicolas Maduro's government harms him.

(Reporting by Mayela Armas; editing by Jonathan Oatis)