Sri Lanka's Ministry of Finance announced that the Easter attacks had cost the country's tourism sector losses of up to $ 1.5 billion this year.
"Tourism is going to be the worst hit," Finance Minister Mangala Samaraweira told a news conference. "We expect a 30 percent drop for expatriates, and this is worth about $ 1.5 billion."
Known for its beaches and greenness, the South Asian island was a record year for tourism in 2018 with 2.33 million visitors.
It was hoping for a five-billion-dollar profit in 2019, up from 4.4 billion in 2018.
Sri Lanka has seen a series of bomb attacks on churches and luxury hotels, killing 253 people, and the Islamic state organization has adopted the attacks.
Based on previous similar cases, such as in France, Belgium, Spain and Tunisia that have witnessed attacks, Samarawira estimated that the sector could return to normal within two years.
"Normally, countries that have suffered attacks separate from the way in which the Islamic state is organized, the political movement has returned to normal within two years in terms of addressing root problems and implementing security measures," the minister said.
The United Kingdom and other countries have asked their nationals to avoid going to Sri Lanka and leaving the country.
Australia said on Friday it was "possible" that other attacks were taking place in Sri Lanka, while suspects linked to the attacks continued to be pursued.
Paris called on the French to limit their movements in the capital, Colombo, and to stay away from places of worship and gatherings across the entire Sri Lankan island.
The number of visitors to Sri Lanka was 4.6%, or 760,000 tourists, in the first quarter of 2019. The most visited tourists are from neighboring India, followed by Britain and China.