"Twenty tunnels are partially back to work since Sunday out of the 250 tunnels still closed because of Egyptian security measures on borders," a source in the Hamas borders and tunnels authority told Anadolu Agency.
The operational tunnels are being used to smuggle food, fuel and construction materials into Gaza.
About 40 to 50 trucks of cement are smuggled through the tunnels per day, down from 300 to 400 trucks daily.
The source said about 3 million litres of fuel were smuggled through the tunnels in the past five days.
Egypt has launched a security crackdown in Sinai in the run up to mass protests that led to the army's removal of elected president Mohammad Morsi.
The security crackdown has caused a fuel shortage in Gaza and doubled the prices of building materials.
An owner of a fuel-smuggling tunnel says the army reinforcements are disrupting the smuggling operations through tunnels.
"The smuggling operations are going slowly and at high risks because of the big security reinforcements at Gaza borders," he told AA.
He said army troops destroyed four fuel pumps and a tanker inside a smuggling tunnel on Friday.
But he said eight tunnels now operate to smuggle construction materials into Gaza, out of 50 tunnels.
"We are now able to smuggle 400 tons and cement and 400 tons of gravel, from more than 2,000 tons in the past," he said.
Another tunnel owner agrees: "Smuggling is being done with great difficulty and at high risks to the life of workers because of army attacks on the tunnels".
Underground tunnels are a lifeline for the Palestinians living in Gaza, which has been under an Israeli blockade since 2006.
Suriname's President Desi Bouterse is weighing his chance that Monday general elections to choose the South American country's next Parliament will keep him and his party in power for another five years.
A prison riot in Bahia, Brazil has left 8 people dead. The prison riot was reportedly triggered by inter-gang tensions
Turkey, Bulgaria and Greece have signed a trilateral agreement to establish a real-time information center dealing with border police, immigration and law enforcement.
Gilad Erdan, a senior Likud Party member has been names as the public security minister.
Libyan tribes have asked Egypt to provide weapons for defence for the Tobruk-based army.
Nigeria's oil companies have come to an agreement with the government and will release fuel within the next six hours easing the oil crisis in the African country.
Congolese soldier have clashed with Rwandan Hutu forces in east DRC as talks of transferring rebel forces from one camp to another have fallen apart.
An Air France flight from Paris has been escorted by US fighter jets to New York's JFK airport.
A gunman has take two people hostage in northeast Ukraine.
Nigerian authorities have said that around 29 fighters have been killed including a foreign Boko Haram commander.
The Israeli Public Prosecutor has called for a 14-month prison sentence for the Dr Aziz Dwait, the Palestinian parliament speaker.
The Baghdad-Kirkuk Highway has reopened. It had been closed since early March due to ISIL threats.
The parliament of Tajikistan has approved a Tajik-Chinese agreement on the extradition of suspected criminals.
Kenya's anti corruption commission has put forward two government ministers who should be charged with abuse of office.
Since the early hours of the morning, protesters blocked roads citywide to deter commuters.
October 25 has been selected as the date for the election of a new president and parliament for Tanzania.