At least 11 people — including one soldier — have died and about 750 more have been arrested as a result of protests in Venezuela, where both sides of the country’s political divide called on followers to take to the streets again on Tuesday, in a sign that the crisis set off by this weekend’s disputed presidential election is intensifying.

Thousands of people massed on Monday in the capital, Caracas, to protest preliminary official election results that they denounced as fraudulent — results showing President Nicolás Maduro winning re-election for another six-year term, handily beating a former diplomat, Edmundo González.

In a preliminary count, Foro Penal, a human rights organisation, said at least six people died amid the protests throughout the country. Families who were gathered at the medical examiner’s office in Caracas reported at least four more people who were shot at protests, who were not in the human rights group’s count.

One soldier died after being shot in the neck, and 48 police officers and soldiers were injured, the ministry of defence said. The ministry said hundreds of electoral centres, elections council offices and machines were vandalised in acts of sabotage by the “extreme Right”.

González called for the police and armed forces to respect the Constitution.

“Unfortunately, in the past hours, we’ve received reports of people killed, dozens of injured and detained,” González said in a video posted on Instagram. “To the security forces and armed forces, we insist that you respect the will Venezuelans expressed on the 28 of July and stop the repression of peaceful protests.”

On Tuesday, an Opposition politician was arrested in Sebucán, east of Caracas, his supporters announced.