COLOMBO (AFP) - The foreign ministers of Britain and France said Wednesday they had failed to persuade Sri Lanka to end its offensive against Tamil rebels and allow aid in for civilians trapped by the fighting. We tried very hard - we insisted and we insisted - but it is up to our friends to allow it or not, French Foreign Minister Bernard Kouchner told a news conference after talks with the Sri Lankan government. British Foreign Secretary David Miliband also said the talks had ended without a breakthrough. Now is the time for the fighting to stop, Miliband said, but later admitted to the BBC that there isnt going to be a ceasefire today as a result of this visit. This does belong on the UNSC agenda, he warned. This is a civil war that does have regional and wider ramifications, and happens to be a massive civilian emergency as well. Theres no question that there has been abuse of civilians by the Tigers, preventing people leaving the conflict zone, and obviously were very concerned about the heavy pounding that has been going on in the conflict zone as well, Miliband said. Kouchner and Miliband visited one camp near the northern town of Vavuniya on Wednesday, where Tamils told them of relatives who had been arrested inside what the government calls welfare villages. Kouchner told AFP that this camp is good, the rest must be awful, referring to the severe shortage of food, shelter and medical essentials reported at other camps. Meanwhile, Sri Lankas President rejected a call by Britain and France for aid workers to be given access to tens of thousands of civilians trapped by fighting with Tamil rebels, an official said. President Mahinda Rajapakse made it clear that the authorities could not allow relief agencies to get into the small patch of land still in the hands of Tamil Tiger rebels because of the ongoing fighting, a spokesman said. The main point raised by the two ministers was access to the area where fighting is going on and the president very clearly and politely said 'no need, the spokesman said after closed-door talks. A government spokesman, however, said the President was slightly more receptive to a call for greater humanitarian access to camps well inside government-held territory for internally displaced people. It could be considered on a case-by-case basis, the spokesman quoted the president as saying. The Sri Lankan navy attacked and sank six Tamil Tiger rebel boats and killed at least 25 guerrillas during a pre-dawn sea battle on Wednesday, a navy spokesman said. Naval craft detected the boats off the coast of the last remaining patch of territory still with the guerrillas, spokesman Captain DKP Dassanayake said. There were at least 25 terrorists in the six boats that were sunk, Dassanayake said. Four of the rebel craft had been packed with explosives for a possible suicide attack against our craft.