Rt Revd Bill Musk has been speaking to Premier after 38 people were killed when two gunmen attacked a tourist resort.
Eight Britons have been confirmed dead so far, with the Tunisian Prime Minister, Habbib Essid, confirming that most of those killed are British.
The country's interior ministry says one of the gunmen was also killed.
The attackers apparently opened fire on holidaymakers as they sunbathed in the town of Sousse.
Tourists have been barricading the doors of their hotel rooms with mattresses.
Calling for prayer, Bishop Bill said: "Pray for the people immediately involved, families of those who've lost lives and those who are traumatised by being there.
"For those who don't know whether to come to Tunisia anymore and for the authorities caught up in [this] and for this poor nation. The majority of people are such lovely people and want to make a success of what they started back in 2011 and are frustrated by what the few individuals can do."
It's reported some of those killed were Britons. Speaking in Brussels, Prime Minister David Cameron said: "This is a threat that faces all of us. These events have taken place today in Tunisia and in France but they can happen anywhere. We all face this threat.
"There will be a ministerially-chaired Cobra meeting, the Government's emergency committee, later on this afternoon to make sure we are doing everything we can to co-operate and co-ordinate with other countries and any information that we have we share with them in fighting this threat."
"We have got to do all we can to help. That means co-operating on counter-terrorism, building our capacity on counter-terrorism, it means dealing with the threat at source whether that is Isil in Syria and Iraq or whether it is other extremist groups around the world."
The he Archbishop of Canterbury, Justin Welby, has responded to the situation in Tunisia, along with the attacks in France and Kuwait. He said: "All of us must be full of grief at the attacks in Tunisia, France and Kuwait.
"They are intended not only to destroy but to divide, not only to terrify but to take from us our own commitment to each other in our societies. Let us together mourn for the victims, weep with the bereaved, support the injured and pray for them all to the God who in Jesus Christ went to the Cross and died rather than bearing a sword.
"Facing such a global and long term menace, we are called to reaffirm our solidarity with each other and affirm the great treasures of freedom, in religion and so many other ways. Our strength is in the God who conquered evil when Jesus rose from the dead, and on His death and victory we find the basis for our future."
Listen to Rt Revd Bill Musk speaking with Premier's Marcus Jones: