Learn German: Der Sprecher sagt, der Vorfall werde durch einen Experten untersucht. - The spokesperson says the incident is being investigated by an expert.

It is in the Konjunktiv I (Present Subjunctive) form, which is often used for reported speech. Because we are reporting what the spokesperson says, we change the normal present tense wird to werde. This signals that we are just passing along someone else's statement.

Why doesn't the second part of the sentence start with dass?

In German reported speech, you can easily drop the word dass. When you do this, the reported clause acts like a regular main clause, which is why the verb werde stays in the normal second position. If you used dass, the verb would be pushed to the end: sagt, dass der Vorfall durch einen Experten untersucht werde.

Does werde untersucht mean this will happen in the future?

No, this is the passive voice, not the future tense. The German passive is formed using werden plus the past participle (untersucht). Because it is reported speech, wird untersucht (is being investigated) becomes werde untersucht. If it were the future tense, the main verb would be in its infinitive form (untersuchen).

Is Experten plural in this sentence?