Anti-Trump protests enter day 4 in New York City

Demonstrators took to the streets in New York City to oppose Donald Trump's election as US president for a fourth straight day.

Some 1,200 people gathered in the Washington Square neighborhood of lower Manhattan, some carrying enormous red balloons and placards with hearts and the words "peace and love."

Others held signs reading "Your Wall Can't Stand in Our Way"- a reference to the anti-immigration barrier the billionaire real estate baron has promised to build on the US border with Mexico.

Demonstrators said they wanted to show solidarity with those they feel may be targeted by Trump's policies once he takes office in January, including Mexicans and Muslims.

"We're here to support the people that Trump has insulted, to show our children that we all have a voice, and to stand up for people's rights," said Kim the 41-year-old Bayer, 41.

"We're afraid a Trump administration will be a disaster for human rights. I've never been so scared in my life. We need to be out here and be loud."

Another young protester, Jamie, said the demonstration aimed "to send a message of love to anybody who's feeling threatened and afraid of being targeted;to immigrants; to minorities; and to anybody shaken by the (election) result."

"There's a lot of uncertainty and we need a message of love," she said.

Organisers plan another large demonstration in the same location on Saturday.

Since Trump's shock victory on Tuesday over Democrat Hillary Clinton, who had been widely tipped to win, thousands have protested in cities across the United States.

While most of the demonstrations have been peaceful, officials said some erupted in violence that caused property damage.

There has also been an uptick in violence by both Clinton and Trump supporters against partisans on the other side, law enforcement officials said.