At least 13 people have been injured in a suspected female suicide bomb attack in the north-western Turkish city of Bursa.
Officials said the bomber blew herself up near the main mosque in the city.
Turkey's health minister Mehmet Muezzinoglu said there were no critical injuries in the blast.
Turkey has been hit by a series of suicide bombings this year, including two in Istanbul blamed on so-called Islamic State, and two in the capital Ankara claimed by Kurdish militants.
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Two rockets hit the Turkish border town of Kilis, injuring a number of people, according to Reuters.
No deaths have been reported.
Kilis has suffered a number of rocket attacks from across the Syrian border in recent months, believed to have been fired from an area controlled by militants from the so-called Islamic State group.
Four Turkish soldiers have been killed and two others wounded after a bomb hit their vehicle while it was travelling in the province of Mardin, according to security sources quoted by Reuters news agency.
Turkey's largely Kurdish southeast has seen violent clashes between government security forces and members of the outlawed Kurdistan Workers Party (PKK) after a ceasefire fell apart last year.
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Several people have reportedly been injured in a car bomb attack in south-east Turkey.
Security sources told Reuters a vehicle laden with explosives rammed into a military base in the town of Hani, located north of the provincial capital of Diyarbakir.
According to initial reports one soldier was killed in the blast and at least 20 other people were injured.
A second boat has left the Greek island of Lesbos taking 79 more migrants to Turkey as part of a deal to return those crossing the Aegean Sea to enter Europe.
One woman was among those on board the Turkish ferry, which left Mytilene port in Lesbos.
Another Turkish ferry carrying 45 migrants left the port earlier.
The migrants sent to Turkey today were mainly from Pakistan.
Forty-five migrants were taken by ferry from Lesbos to Turkey as Greek authorities restarted returns under an EU deal to stem the flow of migrants and refugees to Europe.
The ferry left the port of Mytilene on Friday morning, with a second boat expected to leave later, state television reported.
Two protesters at the port jumped into the sea and began swimming towards the boat and were pulled out of the water by the Greek coastguard.
The first group of 202 migrants to be returned, most of them from Pakistan and Afghanistan, were sent back to Turkey on Monday.
The EU-Turkey agreement to tackle the migrant crisis took effect on Monday but Greek authorities have warned the operation is threatened by a shortage of personnel.
A Downing Street spokesman said Mr Cameron spoke to Mr Tsipras on the phone on Tuesday afternoon.
The Prime Minister welcomed the start the Greek authorities had made to returning migrants to Turkey under the agreement, and reiterated the importance of breaking the link between people making the dangerous crossing of the Mediterranean and securing settlement in Europe... The Prime Minister confirmed that additional UK personnel would be offered to Greece over the coming weeks to provide additional support.
The Pope is to visit Greece, including the island of Lesbos, the Government there has confirmed.
Pope Francis and the Greek Orthodox Patriarch will visit the area on April 14 and 15, ITV News producer Maria Kagkelidou said.