Fears of a potential crackdown on critics of the newly returned Rajapaksa political dynasty in Sri Lanka are rising just days after the election, as officials and journalists who investigated the Rajapaksas for human rights abuses and corruption began trying to flee the country, officials said.

In a case that raised particular alarm, a Sri Lankan employee of the Swiss Embassy in Colombo was abducted on Monday by unidentified men and forced to hand over sensitive embassy information, Switzerland’s foreign ministry said. Officials in Colombo said the men forced her to unlock her cellphone data, which contained information about Sri Lankans who have recently sought asylum in Switzerland, and the names of Sri Lankans who aided them as they fled the country because they feared for their safety after Gotabaya Rajapaksa won the presidency in elections this month.

On the same day, Mr. Rajapaksa imposed a blanket travel ban on more than 700 members of the Sri Lankan police unit that had been investigating the family. And other police officers raided a news outlet critical of the Rajapaksas and forced several journalists to hand their computers over for analysis, in what the police said was an investigation into accusations of hate speech.

On Wednesday, a spokesman for President Rajapaksa at first denied the abduction of the Swiss Embassy employee, and then hours later said that “defense authorities have decided to look into those allegations to ascertain the truth.” More broadly, government officials said there was no intent to quash investigations of the Rajapaksas.