HAMBURG, Germany, July 7 -- German Chancellor Angela Merkel said here on Friday in a statement that talks about the wording to be included in the final statement of the Group of 20 (G20) summit are proving to be "very difficult."

The summit's so-called official negotiators still face a lot of work to forge an agreement on a G20 final declaration before the meeting ends, said the statement.

German news agency dpa also commented that the G20 summit of major economic powers faces a round of tough talks if it is to reach agreement on tough issues such as trade and climate change before the end of the two-day meeting.

During the first day of the G20 summit, a wide range of topics including anti-terrorism, free and fair trade, development in Africa, climate and energy, as well as the development in the Democratic People's Republic of Korea (DPRK), have been discussed.

On anti-terrorism, Merkel said in the statement the information exchange must be intensified considerably and much better.

"It became clear from different perspectives for different continents that international terrorism is a threat to all of us and that terrorism knows no boundaries," said Merkel.

Referring to the topic of world trade, Merkel noted that the world needs a free and fair trade.

Merkel also pointed out that development in Africa is becoming a stronger topic here and every participants will support the topic, saying that she talked with China about cooperation in the third-country projects.

At the end, Merkel described the situation development in the DPRK as "very threatening."

"We hope that the UN Security Council will find an appropriate response to the renewed violation of the Security Council resolution. There was broad agreement here," said Merkel, who chaired the summit, which brings together heads of states and governments from the G20 major economies on Friday and Saturday.