"Our hearts are with the Lebanese people during this difficult and sorrow-filled time," the Foreign Affairs Ministry said in a statement on Wednesday, adding that the Indonesian government would keep monitoring developments in Lebanon after the explosion.

The ministry was maintaining close communication with the Indonesian Embassy in Beirut to ensure the safety of all Indonesian citizens in the country.

Almost 1,450 Indonesian citizens reside in Lebanon currently, comprising over 200 civilians and 1,234 United Nations peacekeepers in the Garuda Contingent, who will apparently help with the evacuation process after the incident that left at least 100 people dead and nearly 4,000 others injured.

Read also: Beirut reels from huge blast, as death toll climbs to at least 100

The number is expected to rise as many people are still missing.

An Indonesian national, identified only as NNE, was reportedly injured in the explosion but he had safely returned home after getting treatment at a local hospital.

The Indonesian Embassy in Beirut can be reached at +961 70 817 310, kemlu.go.id reported.

Meanwhile, emergency medical aid and pop-up field hospitals were dispatched to Lebanon on Wednesday, as the world offered assistance and paid tribute to the victims of the huge explosion that devastated Beirut, AFP reported.

The blast centered on the city's port caused massive destruction and killed more than 100 people, heaping misery on a country already in crisis.

Emergency medical aid from Kuwait arrived in the Lebanese capital on Wednesday morning, as the Lebanese Red Cross said that more than 4,000 people were being treated for injuries after the explosion which sent glass shards and debris flying.

Lebanon's Prime Minister Hassan Diab has called on "friendly countries" to support a nation already reeling from its worst economic crisis in decades as well as the coronavirus pandemic.

Gulf states were among the first to respond, with Qatar announcing it would send field hospitals to ease pressure on Lebanon's strained medical system.

Crews at Doha's Al-Udeid airbase loaded hundreds of collapsible beds, generators and burn sheets onto an air force cargo plane, one of four due to fly from the Gulf to the Mediterranean on Wednesday.

Iran's President Hassan Rouhani said in a message to his Lebanese counterpart that Tehran was "ready to offer medical and medicinal aid and help treat the injured". Jordan's King Abdullah II also promised to dispatch a field hospital. 

"The field hospital will include specialists and medical staff, to contribute in offering medical services and treatment to support our brothers in Lebanon," Jordanian state television said in a report.

Dutch authorities announced that 67 aid workers were headed for Beirut, including doctors, police officers and firefighters.

Close allies and traditional adversaries of Lebanon alike sent their condolences, with Iran and Saudi Arabia — long rivals for influence over the country — both sending messages of support.

"Our thoughts and prayers are with the great and resilient people of Lebanon," Iranian Foreign Minister Mohammad Javad Zarif tweeted. "Stay strong, Lebanon."

Saudi Arabia said it was following the situation with "great concern".

Unusually, neighboring Israel offered humanitarian aid — to a country with which it is still technically at war.

"Defense Minister Benny Gantz and Foreign Minister Gabi Ashkenazi, on behalf of the State of Israel, have offered the Lebanese government — via international intermediaries — medical and humanitarian aid, as well as immediate emergency assistance," a statement said.

United Nations chief Antonio Guterres expressed his "deepest condolences ... following the horrific explosions in Beirut" which he said had also injured some UN personnel.